Ray Optics (KVPY Stream-SA (Class 11) Physics): Questions 25 - 26 of 26

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Question number: 25

» Ray Optics » Mirror Formula

MCQ▾

Question

In a concave mirror, an object is placed at a distance 27 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.

9 cm

b.

4 cm

c.

5 cm

d.

3 cm

Question number: 26

» Ray Optics » Power of a Lens

MCQ▾

Question

A convex lens of focal length 39 cm and a concave lens of focal length 20 cm are placed in close contact with one another. The power of the combination is –

Choices

Choice (4) Response

a.

0.41 D

b.

-2.43 D

c.

2.43 D

d.

-0.41 D

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