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Test (Unit 14&15)

NIQUE SCIENCE ACADEMY U

1

On Fig. 1.2, continue the three rays through the lens that you have drawn. [1]

On the line P in Fig. 1.2, draw the shape of a lens that is used to correct short sight. [1]

Fig. 1.2

Fig. 1.2 shows three parallel rays of light.

On Fig. 1.1, continue the rays to show their paths inside the short-sighted eye until they

it enters the eye has been ignored in Fig. 1.1.

Fig. 1.1

Fig. 1.1 shows a short-sighted eye.1

rays of light

eye lensretina

Rays of light from a distant star are parallel as they reach the lens of the eye. Refraction of light as

(a) (i) strike the retina. [2]

(ii) Explain how your diagram shows that the image of the star seen by the observer is blurred.

...........................................................................................................................................

.......................................................................................................................................[1]

(b)

P

(i)

(ii)

Dedicated to My Son Mohammad Irtaza Zain. Code 5054

Name :................................................................................................................ Pap er: Physics

Date :........................................................ Code: 5054 Class: CII Time Allowed: 40Minutes Maximum Marks: 25

Theory Section: [Total 17 Marks]

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2

2 Fig. 2.1 shows the lens of a simple camera being used to photograph an object.

Fig. 2.1

The lens forms a focused image of the object on the film.

(a) Draw two rays from the top of the object to show how the lens forms the image. [2]

(b) The object moves closer to the camera. State how the lens is adjusted to keep theimage in focus.

..........................................................................................................................................

..........................................................................................................................................

.................................................................................................................................... [1]

(c) Complete Fig. 2.2 to show how white light is split into a spectrum when it passesthrough a glass prism. [3]

Fig. 2.2

prism

white light

object

lens

film

camera

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

3

Describe two ways in which the completed Fig. 3.1 would change.

The beam of yellow light in Fig. 3.1 is replaced with a beam of red light.

Complete Fig. 3.1 by

Fig. 3.1

3 Fig.4.1 shows three wavefronts in a beam of yellow light passing through air. The wavefrontsare one wavelength apart. The beam meets a glass surface. AB is a ray of light that showsthe direction of travel of the wavefronts.

(a)

(i) continuing the ray AB to show the ray inside the glass,

(ii) continuing wavefront 1 inside the glass. [2]

(b) State what happens to the speed and wavelength of the waves as the beam moves fromthe air to the glass.

(i) speed ........................................................................................................................

(ii) wavelength ............................................................................................................[2]

(c)

1. ......................................................................................................................................

..........................................................................................................................................

2. ......................................................................................................................................

......................................................................................................................................[2]

A

B

wavefront 3

wavefront 2

wavefront 1

airglass

Use

3

2

1

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4

8 MCQ SECTION: [Total Marks] sin i

For a certain parallel-sided glass block, the value of is 1.50.sin r

A ray of light passes through the block and emerges at an angle of 60° to the surface of the block.

What is the value of the angle marked X ?

A 19.5° B 35° C 40° D 48.5°

60°

X

air

glass

air

A boy stands beside a girl in front of a large plane mirror. They are both the same distance fromthe mirror, as shown.

Where does the boy see the girl’s image?

girl boy

mirror

A D

B C

What is true for real images formed by a converging lens?

A They are inverted.

B They are on the same side of the lens as the object.

C They can never be shown on a screen.

D They cannot be seen by the human eye.

5

4

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5

Which diagram correctly shows the dispersion of white light by a glass prism?

screen

white

light

white

light

white

light

white

lightred

violet

glass prism

A

violet

red

B

red

violet

C

violet

red

D

A ray of light enters a glass block at an angle of incidence i producing an angle of refraction r in the glass.

glassblock

r

i

Several different values of i and r are measured, and a graph is drawn of sin i against sin r.

Which graph is correct?

1

0.5

00 0.5 1

sin i

sin r

A

1

0.5

00 0.5 1

sin i

sin r

B

1

0.5

00 0.5 1

sin i

sin r

C

1

0.5

00 0.5 1

sin i

sin r

D

8

7

6

Dedicated to My Son Mohammad Irtaza Zain. Code 5054

6

A student starts to draw a ray diagram for an object at O, near a thin convex lens, but is not sure whether the image is formed at X or at F.

OX

F

The correctly drawn image is

A real and formed at F.

B real and formed at X.

C virtual and formed at F.

D virtual and formed at X.

A lens forms a blurred image of an object on a screen.

lens screen

object

How can the image be focussed on the screen?

A by moving the object away from the lens and screen

B by moving the screen away from the lens and object

C by using a brighter object at the same position

D by using a lens of longer focal length at the same position

What happens to light as it passes from glass into air?

A Its frequency decreases because its speed decreases.

B Its frequency increases because its speed increases.

C Its wavelength decreases because its speed decreases.

D Its wavelength increases because its speed increases.

8 A B C D

7 A B C D

6 A B C D

5 A B C D

4 A B C D

3 A B C D

2 A B C D

1 A B C D

MCQ Answer Sheet