Lesson Plan Class Discussion

LESSON PLAN

Educational Unit : SENIOR HIGH SCHOOLSubject : PHYSICSClass/Semester : 10th GRADE / 2nd SemesterLearning Material : Refraction in the LensDuration : 4 meetings (12 lesson hours)

A. Main Competence

1. Menghayati dan mengamalkan ajaran agama yang dianutnya.

2. Menghayati dan mengamalkan perilaku jujur, disiplin, tanggung jawab, peduli (gotong royong, kerjasama, toleran, damai), santun, responsif dan pro-aktif dan menunjukkan sikap sebagai bagian dari solusi atas berbagai permasalahan dalam berinteraksi secara efektif dengan lingkungan sosial dan alam serta dalam menempatkan diri sebagai cerminan bangsa dalam pergaulan dunia.

3. Memahami, menerapkan, menganalisis pengetahuan faktual, konseptual, prosedural berdasarkan rasa ingintahunya tentang ilmu pengetahuan, teknologi, seni, budaya, dan humaniora dengan wawasan kemanusiaan, kebangsaan, kenegaraan, dan peradaban terkait penyebab fenomena dan kejadian, serta menerapkan pengetahuan prosedural pada bidang kajian yang spesifik sesua dengan bakat dan minatnya untuk memecahkan masalah.

4. Mengolah, menalar, dan menyaji dalam ranah konkret dan ranah abstrak terkait dengan pengembangan dari yang dipelajarinya di sekolah secara mandiri, dan mampu menggunakan metoda sesuai kaidah keilmuan.

B. Basic Competence and Indicator

KI Basic Competence Indicator

1.

1.1 Bertambah keimanannya dengan menyadari hubungan keteraturan dan kompleksitas alam dan jagad raya terhadap kebesaran Tuhan yang menciptakannya.

1.2 Menyadari kebesaran Tuhan yang mengatur karakteristik fenomena optic

1.1.1 Give thanks for the existence of the reflection phenomenon

1.1.2 Give thanks for the existence of the refraction phenomenon

1.2.1 Apply the optic instrument in the daily life as a part of phenomenon from God

2. 2.1 Menunjukkan perilaku ilmiah (memiliki rasa ingin tahu; objektif; jujur; teliti; cermat; tekun; hati-hati; bertanggung jawab; terbuka; kritis; kreatif; inovatif dan peduli lingkungan) dalam aktivitas sehari-hari sebagai wujud implementasi

2.1.1 Give questions to observe the reflection phenomenon

2.1.2 Give questions to observe the refraction phenomenon

2.1.3 Give opinions of the reflection phenomenon

2.1.4 Give opinions of the

sikap dalam melakukan percobaan melaporkan, dan berdiskusi

2.2 Menghargai kerja individu dan kelompok dalam aktivitas sehari hari sebagai wujud implementasi sikap dalam melakukan percobaan dan diskusi

refraction phenomenon

2.2.1 Appreciate the individual work for discuss the reflection phenomenon

2.2.2 Appreciate the individual work for discuss the refraction phenomenon

2.2.3 Appreciate the group work for discuss the reflection phenomenon

2.2.4 Appreciate the group work for discuss the refraction phenomenon

3.

3.9 Menganalisis cara kerja alat optik menggunakan sifat pencerminan dan pembiasan cahaya oleh cermin dan lensa

3.9.1 Analyze the reflection of light in the mirror

3.9.2 Analyze the refraction of light in the lens

4.

4.9 Menyajikan ide atau rancangan sebuah alat optik dengan menerapkan prinsip pemantulan dan pembiasan pada cermin dan lensa

4.9.1 Design an experiment of reflection in the mirror

4.9.2 Design an experiment of refraction in the lens

C. Learning ObjectiveSpiritual and Social Competence1st – 4th MeetingStudents are able to:

1.1.1.1 Give thanks for the existence of the reflection and refraction phenomenon by given a motivation of that phenomenon for fill self-assessment of spiritual attitude

1.2.1.1 Know the optic instruments in daily life as a part of phenomenon from God by given pictures of optic instruments

1.2.1.2 Apply the benefit of optic instruments in daily life as a part of phenomenon from God by given motivation from video, how to use the optic instruments

2.2.1.1 Appreciate the individual work for discuss the reflection phenomenon by fill a self-assessment of social attitude

2.2.2.1 Appreciate the individual work for discuss the refraction phenomenon by fill a self-assessment of social attitude

2.2.3.1 Appreciate the group work for discuss the reflection phenomenon by fill a

self-assessment of social attitude

2.2.4.1 Appreciate the group work for discuss the refraction phenomenon by fill a self-assessment of social attitude

Social, Knowledge and Skill Competence1st MeetingStudents are able to:

2.1.1.1 Give questions to observe the reflection phenomenon from the video, how the light hit the mirror

2.1.3.1 Give opinions of the reflection phenomenon, after watch the video, how the light hit the mirror

3.9.1.1 Describe the reflection phenomenon, how the light hit the mirror by given video, how we can see ourselves in the mirror

3.9.1.2 Identify the kind of mirrors and how the light reflect in each mirror by given phenomenon and pictures

3.9.1.3 Identify the concept of reflection phenomenon, how the light result the shadow in each mirror from the phenomenon given

2nd MeetingStudents are able to:

4.9.1.1 Prepare the materials and tools for reflection’s experiment in group discussion by given assessment heading (rubric)

4.9.1.2 Use the materials and tools for reflection’s experiment until obtain the data in group discussion

4.9.1.3 Do the group work for solve the problem of reflection’s experiment phenomenon by given a worksheet

4.9.1.4 Collect data from the reflection’s experiment in group discussion

4.9.1.5 Analyze the data until obtain the fixed result from the reflection’s experiment in group discussion

4.9.1.6 Conclude the result of experiment by one of the each group communicate in front of the class for summarize the whole result from reflection’s experiment

3rd MeetingStudents are able to:

2.1.2.1 Give questions to observe the refraction phenomenon from the video, how

the light hit the lens

2.1.4.1 Give opinions of the refraction phenomenon, after watch the video, how the light hit the lens

3.9.2.1 Describe the refraction phenomenon, how the light hit the lens by given video, how we can see on the lens; such as camera, microscope, telescope, glasses.

3.9.2.2 Identify the kind of lens and how the light refract in each lens by given phenomenon and pictures

3.9.2.3 Identify the concept of refraction phenomenon, how the light result the shadow in each lens from the phenomenon given

4th MeetingStudents are able to:

4.9.2.1 Prepare the materials and tools for refraction’s experiment in group discussion by given assessment heading (rubric)

4.9.2.2 Use the materials and tools for refraction’s experiment until obtain the data in group discussion

4.9.2.3 Do the group work for solve the problem of refraction’s experiment by given a worksheet

4.9.2.4 Process the data established from the refraction’s experiment in group discussion

4.9.2.5 Analyze the data until obtain the fixed result from the refraction’s experiment in group discussion

4.9.2.6 Conclude the result of experiment by one of the each group communicate in front of the class for summarize the whole result from refraction’s experiment

D. Learning MaterialFourth Meeting: Refraction in the Lens

E. Learning MethodFourth Meeting: Class Discussion

F. Learning ActivitiesFourth Meeting (150 minutes)1. Preface Activities (10 minutes)

a. Teacher greets the students

b. Teacher leads the class to pray before the lesson

2. Core Activities (125 minutes)1st Phase: Provides Objectives and Set (15 minutes)a. Teacher shows the video about the myopic eye see without and by glasses. Then

teacher is letting the students to observe the videos. Students give attention to the video given. (Observing)

b. Teacher asks students about the Snellius’ Law of refraction as a prior knowledge. Teacher hopes that students could answer the content of Snellius’ Law of

refraction: “When the light propagates from less dense to denser medium, the light is refracted approach the normal lines. When the light propagates from denser to less dense medium, the light is refracted keep away the normal lines”

c. Teacher give the rules of topic’s today, that is refraction in the lens.

2nd Phase: Focus the Discussion (25 minutes) a. Teacher gives initial questions:

How many kind of the lens? What are the optic instruments that use the lens, except glasses?Teacher hopes that the student could answer the question, such as: There are two lens, convex lens and concave lens. Convex lens has three kind

of lens; those are biconvex, plan-convex, and convex-concave. Concave lens also has three kind of lens; those are biconcave, plan-concave, and concave-convex.

Microscope, loop, telescope, camerab. Teacher gives the phenomenon about myopic and hypermetropic (hipermetropi)

eye. Teacher is letting the students to observe the two of phenomenon. Students observe two of phenomenon (Questioning) Teacher hopes the students observe that: “There are a difference of two

phenomenon, the problem is different, because the myopic eye need optic instrument that can seen the far object but the hypermetropic (hipermetropi) eye need optic instrument that can seen the near object”

c. Teacher gives puzzling situation :Teacher asks the students, “What is the kind of lens that suitable with the each phenomenon? Myopic and hypermetropic (hipermetropi) eye can see a fix object in front of the eye. What are the kind of especially lens we need for myopic and hypermetropic (hipermetropi) eye?” Students may hypothesize/respond the phenomena: Myopic eye need

concave lens, especially concave-convex lens and hypermetropic (hipermetropi) eye need convex lens, especially convex-concave lens.

d. Teacher asks the students to form a group that contains for 4 persons.e. Teacher gives worksheet to the groups.f. Teacher reads the rule of discussion.

1) Actively give opinions.2) Appreciate others opinions.3) Brave to give opinion and be an open-minded.

4) Have no fear to be criticized.5) Be active to give opinion from beginning to end of discussion.

3rd Phase: Hold Discussion (40 minutes)a. Teacher monitors the discussion process in each group.

Students gather to discuss the phenomena given.b. Teacher observes the students’ behavior while discussion.

Students and each group would:1) Do experiment about the refraction in concave and convex lens.2) Collect and process the data established. (Collecting data) 3) Analyze the data until obtain the result. (Associating/ Reasoning) 4) Conclude the ‘whole’ result from the experiment.

c. After several times, teacher asks each group to conclude the result of their discussion. Each group present their discussion result. (Communicating)

d. Teacher helps the student to make a conclusion from the groups conclusion. Students make a ‘big’ conclusion.

4th Phase: End Discussion (25 minutes)a. Teacher scaffold the students’ knowledge by giving question in order to clarify

the concept from the conclusion they had made.“What is the difference of concave and convex lens?”

b. Teacher clarifies the concept of convex and concave lens. Student try to explain the difference of concave and convex lens by using the

teacher’s scaffolding question and from the knowledge they got in the last activity. (Communicating)

5th Phase: End Discussion (20 minutes)a. Teacher gives a video about eye see on the microscope and telescope.

Students observe the video and give their opinion. (Communicating)

3. Closure Activities (15 minutes)a. Teacher asks the student to reflect the learning result that they are got today by

giving question: How do light propagates in the convex and concave lens? What is the characteristic of shadow in concave and convex lens?

b. Teacher provides a self-assessment of spiritual and social attitude for each student.

c. Teacher greets students.

G. Media, Materials, and Learning Sources1. Media:

Power Point Video

2. Materials:Materials Amount

1. Biconcave Lens 6 units2. Plan-concave Lens 6 units3. Concave-convex Lens 6 units4. Biconvex Lens 6 units5. Plan-convex Lens 6 units6. Convex-concave Lens 6 units7. Needle 6 packs8. Stick of Infrared ray 6 units9. Paper 6 pieces10. Styrofoam 6 pieces

3. Learning Sources:a. Nowikow I, Heimbecker B, Bosomworth D - Physics Concepts and Connections -

Irwin – 2001b. Halliday, Resnik – Fundamental of Physics 8th Edition

H. Assessment1. Assessment technique

a. Attitude competence : Observation and Self-assessmentb. Skill competence : Practice

2. Assessment instrument and scoring guidea. Attitude competence :

Self-assessment Sheet (Attachment 1)1) Spiritual Attitude : Attachment 1.12) Social Attitude : Attachment 1.2

b. Skill competence : Practice (Attachment 2)

1) Assessment Rubric Sheet : Attachment 2.12) Student Worksheet : Attachment 2.2.13) Teacher Worksheet : Attachment 2.2.2

ATTACHMENT 1: SELF-ASSESSMENT OF ATTITUDE SHEET

Attachment 1.1It used to assess students spiritual attitude while learning process.

Self-Assessment Sheet of Spiritual Attitude

Name : ………………….………………….………………….………………….Class : ………………….………………….………………….………………….Date : ………………….………………….………………….………………….Material : ………………….………………….………………….………………….

INSTRUCTION:Give check (√) in the score column according to the spiritual column depend on what you have done. The criteria are the following:

4: Always, if you did the same as the statement3: Often, if you often do the statement and sometimes don’t2: Sometimes, if you sometime do the statement and you don’t really do1: Rarely, if you rarely do the statement

No STATEMENT 4 3 2 11 I pray before and after doing activity.2 My belief in God is increase after studying this lesson

especially about the refraction in the concave and convex lens.

3 I give greeting in the beginning and ending of my presentation or give respond based on my religion.

4 I give thanks to God after doing something.5 I say God’s majesty after seeing His greatness

Total

Scoring guide:Final score using 1 to 4Calculation of final score using formula:

obtained scoremaximal score

x 4=final score=x

The students get score: Excellent : if get score 3.5 ˂ x ≤ 4.0 Good : if get score 2.5 ˂ x ≤ 3.5 Enough : if get score 1.5 ˂ x ≤ 2.5 Less : if get score 1.0 ˂ x ≤ 1.5

Attachment 1.2It used to assess students attitude in appreciating individual work and teamwork while learning process.

Self-Assessment Sheet of Social Attitude


INSTRUCTION:Give check (√) in the score column according to the attitude column depend on what you have done or not. The criteria are the following:

No AspectDone

Yes No1. I give my opinion on experiment activity2. I can accept my friend’s opinion if there is difference of work

result in the experiment activity3. I don’t do anything when there is difference of experiment result

with other group4. I take part on teamwork5. I help my group finishing final result in experiment activity6. I finish my task on experiment activity with teacher’s guide7. The task is finished based on my opinion without group

discussion8. The task is finished based on group discussion9. I finish the task on experiment activity with teacher’s guide10. I try to get the best result in group discussion on experiment

activity11. I try to do the task based on the procedure on worksheet12. I finish group discussion on experiment activity on time13. I get the result objectively in group discussion from experiment

activity14. I finish group discussion on experiment activity over the time

Maximum score

Scoring guide: 1. On the statements above, there is positive statement and negative statement.

The positive statement are number 1, 2, 4, 5, 8, 9, 11, and 12, while the negative statement are number 3, 6, 7, 10, 13, and 14.

2. Scoring for positive statement: yes = 1, no = 0.For negative statement: yes = 0, no = 1

3. Score = Totalobtained score

Maximum Score x 4


ATTACHMENT 2: SKILL ASSESSMENT SHEET

Attachment 2.1It used to assess students skill in teamwork experiment activity about the refraction in concave and convex lens.

Assessment Sheet of Practice


INSTRUCTION:

No Aspect Score1 2 3

1. Preparing materials in experiment activity to obtain data.2. Using tools and materials in experiment activity to obtain data.3. Processing the experiment result. 4. Analyzing the data from experiment activity.5. Conclude the result of experiment activity.

Maximum ScoreGive check (√) in the score column according to the attitude column depend on what student have done. The criteria are the following:

Indicator Score:

No. Score Indicator

1.1 Not preparing tools and material for experiment activity.2 Preparing tools and material for experiment activity with teachers help.3 Preparing tools and material for experiment activity without teachers help.

2.1

Can’t use tools and materials in experiment activity because don’t know the function of them in the experiment.

2 Can use tools and materials in experiment activity with teachers help.3 Can use tools and materials in experiment activity without teachers help.

3.1

Can’t process the result of experiment activity because don’t know what to find.

2 Can process the result of experiment activity but not complete. 3 Can process the result of experiment activity and get complete data.

4.1 Can’t analyze data from the experiment activity, even with teacher’s help.2 Can analyze data from the experiment activity with teacher’s help. 3 Can analyze data from the experiment activity without teacher’s help.

5. 1 Can’t conclude the result of experiment activity.2 Can conclude the result of measurement activity with teacher’s help.

3 Can conclude the result of measurement activity without teacher’s help.

Scoring guide:Final score using 1 to 3Calculation of final score using formula:

obtained scoremaximal score

x 3=final score


Attachment 2.2: WorksheetAttachment 2.2.1It used to guide students for teamwork experiment activity about the refraction in concave and convex lens.

Student Worksheet

Bacalah pernyataan di bawah ini.

Mita tidak dapat melihat dengan baik, kesehatan matanya terganggu karena dia sering membaca terlalu dekat dan melihat layar laptop berjam-jam. Akhirnya, sekarang Mita tidak dapat melihat sesuatu dengan jarak yang cukup jauh. Matanya tidak dapat menangkap objek dari jarak kejauhan, namun dari jarak dekat mata Mita masih mampu untuk menangkapnya dengan baik. Sedangkan ayah Mita, kebalikan darinya, ayah Mita dapat melihat objek dari jarak yang cukup jauh, namun tidak dapat menangkap objek dari dekat. Mita dan ayahnya ini membutuhkan alat optik yang dapat membantu mereka melihat dengan jelas, yaitu kacamata.

Kacamata ini yang menentukan, apakah Mita dan ayahnya dapat melihat seperti mata normal lainnya. Kacamata membutuhkan lensa tertentu untuk dapat membantu orang yang memakainya. Lensa ini lah yang menentukan apakah objek yang ada di depan mata dapat ditangkap dengan baik oleh retina mata, sehingga jenis lensa tidak dapat digunakan secara sembarangan, tergantung kebutuhan penangkapan objek pada mata. Lensa dibedakan menjadi dua jenis yaitu lensa cekung dan cembung, dimana masing-masing lensa memiliki tiga macam lensa; yaitu bikonveks, plan-konveks, konveks-konkaf untuk lensa cembung, sedangkan lensa cekung terdiri atas bikonkaf, plan-konkaf, dan konkaf-konveks. Lalu, bagaimana jenis kacamata yang harus digunakan oleh Mita dan ayahnya?

Dari pernyataan di atas, rumusan masalah apa yang dapat diselesaikan :………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………Berdasarkan rumusan masalah yang disebutkan sebelumnya, hipotesis apa yang dapat disampaikan :………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Alat dan BahanBahan Jumlah

1. Lensa Bikonkaf 12. Lensa Plan-konkaf 13. Lensa Konkaf-konveks 1 4. Lensa Bikonveks 1 5. Lensa Plan-konveks 1 6. Lensa Konveks-Konkaf 1

7. Jarum 1 pack8. Stick of Infrared ray 1 9. Kertas 1 10. Sterefoam 1

Identifikasi Variabel Percobaan

1. Variabel Manipulasi : …………………………………………………………………2. Variabel Respon : …………………………………………………………………3. Variabel Kontrol : …………………………………………………………………

Berdasarkan variabel percobaan yang kalian tuliskan, kemudian tuliskan pula prosedur percobaan yang kalian lakukan untuk menemukan penyelesaian dari rumusan masalah yang telah dituliskan sebelumnya.………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………Tuliskan data apa saja yang kalian peroleh dari percobaan yang kalian lakukan. (dapat berupa gambar)……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………Berdasarkan data yang telah diperoleh, tuliskan kesimpulan yang kalian dapatkan dari percobaan yang telah kalian lakukan.……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………Berdasarkan kesimpulan yang kalian temukan dari percobaan yang telah dilakukan, kembali ke pernyataaan awal tentang kacamata yang cocok untuk Mita dan ayah. Dari percobaan yang kalian lakukan, lensa kacamata apa yang cocok untuk Mita dan ayahnya, tuliskan penjelasanmu.………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Attachment 2.2.2It used to guide teacher for students activity about the refraction in concave and convex lens. It fills the possibility of students’ answer.

Teacher Worksheet

Bacalah pernyataan di bawah ini.Mita tidak dapat melihat dengan baik, kesehatan matanya terganggu karena dia sering

membaca terlalu dekat dan melihat layar laptop berjam-jam. Akhirnya, sekarang Mita tidak dapat melihat sesuatu dengan jarak yang cukup jauh. Matanya tidak dapat menangkap objek dari jarak kejauhan, namun dari jarak dekat mata Mita masih mampu untuk menangkapnya dengan baik. Sedangkan ayah Mita, kebalikan darinya, ayah Mita dapat melihat objek dari jarak yang cukup jauh, namun tidak dapat menangkap objek dari dekat. Mita dan ayahnya ini membutuhkan alat optik yang dapat membantu mereka melihat dengan jelas, yaitu kacamata.

Kacamata ini yang menentukan, apakah Mita dan ayahnya dapat melihat seperti mata normal lainnya. Kacamata membutuhkan lensa tertentu untuk dapat membantu orang yang memakainya. Lensa ini lah yang menentukan apakah objek yang ada di depan mata dapat ditangkap dengan baik oleh retina mata, sehingga jenis lensa tidak dapat digunakan secara sembarangan, tergantung kebutuhan penangkapan objek pada mata. Lensa dibedakan menjadi dua jenis yaitu lensa cekung dan cembung, dimana masing-masing lensa memiliki tiga macam lensa; yaitu bikonveks, plan-konveks, konveks-konkaf untuk lensa cembung, sedangkan lensa cekung terdiri atas bikonkaf, plan-konkaf, dan konkaf-konveks. Lalu, bagaimana jenis kacamata yang harus digunakan oleh Mita dan ayahnya?

Dari pernyataan di atas, rumusan masalah apa yang dapat diselesaikan :Bagaimana sifat pembentukan bayangan untuk setiap lensa ?Lensa apa yang cocok untuk digunakan Mita dan ayahnya?

Berdasarkan rumusan masalah yang disebutkan sebelumnya, hipotesis apa yang dapat disampaikan :

Lensa yang cocok untuk Mita adalah jenis lensa cekung, sedangkan untuk ayahnya adalah lensa cembung

Alat dan BahanBahan Jumlah

11. Lensa Bikonkaf 112. Lensa Plan-konkaf 113. Lensa Konkaf-konveks 1 14. Lensa Bikonveks 1 15. Lensa Plan-konveks 1 16. Lensa Konveks-Konkaf 1 17. Jarum 1 pack18. Stick of Infrared ray 1 19. Kertas 1 20. Sterefoam 1

Identifikasi Variabel Percobaan

1. Variabel Manipulasi : Jenis Lensa cembung dan cekung2. Variabel Respon : Pembentukan bayangan untuk setiap lensa3. Variabel Kontrol : Jarak sinar datang dari lensa

Berdasarkan variabel percobaan yang kalian tuliskan, kemudian tuliskan pula prosedur percobaan yang kalian lakukan untuk menemukan penyelesaian dari rumusan masalah yang telah dituliskan sebelumnya.1. Meletakkan kertas di atas sterefoam2. Menggambar cetakan lensa (salah satu) di atas kertas3. Menggambar garis normal pada lensa4. Menancapkan jarum di jarak tertentu pada lensa, sebagai penanda sinar dating5. Menyalakan stik sinar infrared tepat pada jarum yang sudah ditancapkan6. Melihat bagaimana bayangan dapat terbentuk7. Menandai bayangan yang terbentuk dengan jarum8. Menggaris berkas sinar datang hingga membentuk bayangan di atas kertas9. Melakukan langkah 1 hingga 8 untuk 5 lensa lainnya yang disediakan, dengan jarak

sinar datang ke lensa selalu sama untuk setiap lensa.

Tuliskan data apa saja yang kalian peroleh dari percobaan yang kalian lakukan. (dapat berupa gambar)

Berdasarkan data yang telah diperoleh, tuliskan kesimpulan yang kalian dapatkan dari percobaan yang telah kalian lakukan.

Lensa bikonkaf menyebarkan berkas sinar, Lensa bikonveks mengumpulkan berkas sinar

Berdasarkan kesimpulan yang kalian temukan dari percobaan yang telah dilakukan, kembali ke pernyataaan awal tentang kacamata yang cocok untuk Mita dan ayah. Dari percobaan yang kalian lakukan, lensa kacamata apa yang cocok untuk Mita dan ayahnya, tuliskan penjelasanmu.

Mita cocok menggunakan kacamata dengan lensa bikonkaf dan ayah menggunakan kacamata dengan lensa bikonveks

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Lesson Plan Class Discussion