Ray Optics (KVPY Stream-SA (Class 11) Physics): Questions 20 - 24 of 26

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Question number: 20

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

A point source of light is moving at a rate of 2 cm-s–1 towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at

Choices

Choice (4) Response

a.

8 cm-s–1 away from the lens

b.

4 cm-s–1 away from the lens

c.

4 cm-s–1 towards the lens

d.

8 cm-s–1 towards the lens

Question number: 21

» Ray Optics » Mirror Formula

MCQ▾

Question

In a concave mirror, an object is placed at a distance 12 cm from the focus and its image is formed at a distance 3 cm from the focus. The focal length of the mirror is,

Choices

Choice (4) Response

a.

4 cm

b.

5 cm

c.

6 cm

d.

3 cm

Question number: 22

» Ray Optics » Power of a Lens

MCQ▾

Question

A convex lens of focal length 21 cm and a concave lens of focal length 17 cm are placed in close contact with one another. The power of the combination is –

Choices

Choice (4) Response

a.

2.43 D

b.

-2.43 D

c.

0.41 D

d.

-1.12 D

Question number: 23

» Ray Optics » Mirror Formula

MCQ▾

Question

In a concave mirror, an object is placed at a distance 25 cm from the focus and its image is formed at a distance 4 cm from the focus. The focal length of the mirror is,

Choices

Choice (4) Response

a.

15 cm

b.

20 cm

c.

10 cm

d.

5 cm

Question number: 24

» Ray Optics » Magnification

MCQ▾

Question

An object of height 2.5 cm is placed at a distance of 10 cm in front of a concave lens of power, – 12 diopters. The height of the image is –

Choices

Choice (4) Response

a.

2.46

b.

1.46

c.

1.13

d.

2.13

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