F - X C h a n ge V e iew D e P r Click to buy NOW! w · soalan . a. 4531/3 1 . A student carries out an experiment to investigate the relationship between the ... 2011 PSPM Kedah

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11

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11





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Pencil

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Pencil

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Pencil

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Pencil

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1. The changes of direction and 2. speed of light when it crosses the boundary 3. between two materials of different optical densities.

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Real, inverted and magnified.

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X: m = 4 Y: m = 10 Z: m = 20









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Y and Z

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X and Z

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Lens Z

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Larger and clearer image.









CONFIDENTIAL

Section A

Bahagian A

[28 marks /28 markah]

Answer all questions Jawab semua soalan

4531/3

1

A student carries out an experiment to investigate the relationship between the sine of the angle of incidence, i and the sine of the angle of refraction, r of a glass

block.

The arrangement of the apparatus for the experiment is shown in Figure 1.1

Ray box

Incidence ray

Glass block

i

M

r

Protractor

N

Refracted ray

FIGURE 1.1 /RAJAH 1.1

A ray of light is directed along the angle of incidence, i = 20o and forms the angle

of refraction, r. The angle of refraction is measured by using a protractor. The

corresponding reading of r1 , is shown in Figure 1.2 on page 5.

The experiment is repeated by varying the angle of incidence, i, to 30o, 40o, 50o

and 60o. The corresponding angles of refraction, r are shown in Figures 1.3, 1.4,

1.5 and 1.6 on pages 6 and 7 respectively.

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CONFIDENTIAL

FIGURE 1.2

i = 200

The reading of the angle of refraction, r when i = 200

4531/3

4531/3

CONFIDENTIAL

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CONFIDENTIAL

4531/3

i = 300

FIGURE 1.3


i = 400

FIGURE 1.4

RAJAH 1.4


Turn over

4531/3 CONFIDENTIAL

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CONFIDENTIAL

FIGURE 1.5

FIGURE 1.6

i = 500


i = 600


4531/3

4531/3

CONFIDENTIAL

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CONFIDENTIAL

(a) For the experiment described on page 4 , identify

4531/3

(i)

(ii)

the manipulated variable pembolehubah dimanipulasikan

…………………………………………………………………………

[ 1 mark ]

the responding variable

1(a)(i)

pembolehubah bergerak balas

1(a)(ii)

…………………………………………………………………………

[ 1 mark ]

(iii) the fixed variable

pembolehubah dimalarkan

1(a)(iii)

…………………………………………………………………………

[ 1 mark ]

(b) Determine the angle of incidence, i

and the corresponding angle of

refraction, r,. for Figures 1.2, 1.3, 1.4, 1.5 and 1.6.

Tabulate your results for i, r, sin i and sin r in the space below.

Tentukan nilai sudut tuju,i dan nilai sudut biasan, r yang sepadan pada Rajah 1.2, 1.3, 1.4,

1.5 dan 1.6,

Jadualkan keputusan anda bagi i, r, sin i dan sin r pada ruang di bawah.

1(b)

[ 6 marks ]

Turn over

4531/3 CONFIDENTIAL

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Sticky Note

angle of incidence

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angle of refraction

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density of glass block, refractive index of glass block















CONFIDENTIAL

4531/3

For

Examiner’s

(c) On the graph paper on page 10, plot a graph of sin r against sin i. Pada kertas graf di halaman 8, lukiskan graf sin r melawan sin i.

1(c)

Use

[ 5 marks ]

(d) Based on your graph, state the relationship between sin r and sin i.

Berdasarkan graf anda, nyatakan hubungan di antara sin r and sin i.

1(d) …………………………………………………………………………………

[ 1 mark ]

(e) State one precaution that should be taken to obtain the accurate readings of i.

Nyatakan satu langkah berjaga-jaga yang perlu diambil untuk mendapatkan bacaan i yang

jitu.

…………………………………………………………………………………

1(e)

…………………………………………………………………………………

[ 1 mark ]

Total

4531/3

CONFIDENTIAL

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Sticky Note

sin r is directly proportional to sin i

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Sticky Note

observe the protractor reading perpendicular to the eyes, to prevent parallax error, repeat the experiment for three times to get an average value to prevent systematic error















SULIT 4531/3

4431/3 SULIT

7

2 A student carries out an experiment to investigate the relationship between the object distance, u, and linear magnification, M, of the image formed by a convex lens.

The results of this experiment are shown in a graph of u against M

1 in Diagram 2 on

page 9. The results are used to determine the focal length of the convex lens.

Seorang pelajar menjalankan suatu eksperimen untuk menyiasat hubungan antara jarak objek, u, dan pembesaran linear, M, bagi imej yang dibentuk oleh sebuah kanta cembung.

Keputusan eksperimen ini ditunjukkan dalam suatu graf u melawan M

1 dalam Rajah 2

pada halaman 9. Keputusan eksperimen ini digunakan untuk menentukan panjang fokus kanta cembung

itu. (a) Based on the graph in Diagram 2:

Berdasarkan graf di Rajah 2:

(i) State the relationship between u and M..

Nyatakan hubungan antara u dan M. ……………………………………………………………………………….. [1 mark / markah] (ii) Determine the value of u when M = 2.5. Show on the graph, how you determine the value of u.

Tentukan nilai u apabila M = 2.5. Tunjukkan pada graf, bagaimana anda menentukan nilai u. u = …………….. [3 marks / markah]

(b) The relationship between u and M

1 is given by the formula

fM

fu +

= 1,

where f is the focal length of the lens.

Hubungan antara u dan M

1 diberikan oleh formula

fM

fu +

= 1,

di mana f ialah panjang fokus kanta itu.

j*k

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Text Box

21



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Sticky Note

u increases linearly with 1/M

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Sticky Note

1/ 2.5= 0.4



SULIT 4531/3

4431/3 SULIT

8

(i) Determine the value of f from the u-intercept. Show on the graph how you determine the value of f.

Tentukan nilai f daripada pintasan-u. Tunjukkan pada graf bagaimana anda menentukan nilai f. f = ……………… [2 marks / markah] (ii) Calculate the gradient of the graph.

Hitungkan kecerunan graf itu. [3 marks / markah]

(iii) From your answers in 2(b)(i) and 2(b)(ii), calculate the average value of the focal length, f, of the lens.

Daripada jawapan anda kepada 2(b)(i) dan 2(b)(ii), hitungkan nilai purata bagi panjang fokus, f, bagi kanta itu.

[2 marks / markah]

(c) State one precaution that should be taken to improve the accuracy of the readings in this experiment.

Nyatakan satu langkah berjaga-jaga yang perlu diambil untuk memperbaik ketepatan bacaan dalam eksperimen ini.

……………………………………………………………………………………... ……………………………………………………………………………………... [1 mark / markah]

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Text Box

22



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Sticky Note

f = 14.5 cm

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Sticky Note

m= 25.5-14.5/ (0.7-0) = 15.7 cm

kumsoon

Sticky Note

(14.5 +15.7)/ 2 = 15.1 cm

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Sticky Note

carry out experiment in darkened room so that the image canbe seen clearly = eye must be perpendicular to the scale of metre rule to avoid paralax error



SULIT 4531/3

4431/3 SULIT

9

Graph of u against M

1

Graf u melawan M

1

5

10

15

20

25

0.1

30

0 0.2 0.3 0.4 0.5 0.6

u / cm

0.7

M

1

5

10

15

20

25

0.1

30

0 0.2 0.3 0.4 0.5 0.6

u / cm

0.7

M

1

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Text Box

23





A B 40

30

θ α

Ali

Section C Bahagian C

[20 marks]

[20 markah]

Answer any one question from this section. Jawab mana-mana satu soalan daripada bahagian ini.

11 Diagram 11.1 shows Ali standing at the side of a pond. Ali can see the image of the fish

and the image of the dragon-fly in the water as shown by the ray diagram. Rajah 11.1 menunjukkan Ali berdiri di tepi kolam. Ali dapat melihat imej ikan dan imej pepatung di dalam air seperti yang ditunjukkan oleh rajah sinar. Diagram 11.1 Rajah 11.1

(a) (i) What is the meaning of virtual image ? [1 mark] Apakah maksud imej maya ? [1 markah]

(ii) Explain how Ali can see the image of the fish and the image of the dragon-fly. State the phenomenon of light that is involved in each case. [4 marks] Terangkan bagaimana Ali dapat melihat imej ikan dan imej pepatung. Nyatakan fenomena cahaya yang terlibat dalam setiap kes. [4 markah]

(b) (i) Calculate the angle θ and α .

[ Refractive index of water is 1.33 ] [4 marks] Hitung sudut θ dan α . [ Indeks biasan air ialah 1.33 ] [4 markah]

(ii) State one characteristic of the image of the dragon-fly. [1 mark] Nyatakan satu ciri bagi imej pepatung. [1 markah]

Water

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kumsoon

Sticky Note

image that caanot be shown/ form on screen

kumsoon

Sticky Note

1. Ray of fish refracted at B 2. refraction 3.ray refracted from dragon at A 4. reflection happen

kumsoon

Sticky Note

@ = 90-30 @ =60 1.33 = sin */ sin 40 * = 58.75^

kumsoon

Sticky Note

virtual/ same size/ laterally inverted



(c) Table 11 shows the design of five torchlights P, Q, R, S and T. Jadual 11 menunjukkan reka bentuk bagi lima lampu suluh P, Q, R, S dan T. Table 11 Jadual 11 You are asked to investigate the characteristics of the five torchlights shown in Table 11. Explain the suitability of each characteristics of the torchlight and determine the torchlight which can produce a strong parallel beam of light. Give reasons for your choice. [10 marks] Anda ditugaskan untuk mengkaji ciri-ciri bagi lima lampu suluh seperti yang ditunjukkan dalam Jadual 11. Terangkan kesesuaian setiap ciri lampu suluh itu dan tentukan lampu suluh yang boleh menghasilkan satu alur cahaya selari yang terang. Beri sebab untuk pilihan anda. [10 markah]

P

Q

R

S

Concave reflector Pemantul cekung

Bulb beyond principle focus Mentol di luar titik fokus

Battery Bateri

Constantan connecting wire Wayar penyambung konstantan

Bulb at principle focus Mentol di titik fokus Copper connecting wire

Wayar penyambung kuprum

Battery Bateri

Concave reflector Pemantul cekung

Convex reflector Pemantul cembung

Bulb at the pole of the mirror Mentol di kutub cermin

Battery Bateri

Copper connecting wire Wayar penyambung kuprum

Constantant Connecting wire Wayar penyambung konstantan Battery

Bateri

Convex reflector Pemantul cembung

T

Bulb between the two plane mirror Mentol antara dua cermin satah Iron connecting wire

Wayar penyambung besi Battery

Bateri

Plane reflector Pemantul satah

Bulb at the pole of the mirror Mentol di kutub cermin

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Sticky Note

1.concave mirror = converging reflected ray 2. bulb at principle focus=reflected ray in parallel beam 3. batteries connected in series=large current/ voltage 4. copper connecting wire=low resistance/ high current Q= concave mirror, bulb at principle, series batteries and copper wire



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F - X C h a n ge V e iew D e P r Click to buy NOW! w · soalan . a. 4531/3 1 . A student carries out an experiment to investigate the relationship between the ... 2011 PSPM Kedah