# Ray Optics-Lens Maker's Formula and Lens Formula (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 5 - 7 of 7

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## Question number: 5

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

Appeared in Year: 2015

MCQ▾

### Question

An optical device is constructed by fixing three identical convex lenses of focal lengths 10 cm each inside a hollow tube at equal spacing of 30 cm each. One end of the device is placed 10 cm away from a point source. How much does the image shift when the device is moved away from the source by another 10 cm?

### Choices

Choice (4) Response

a.

0

b.

15 cm

c.

5 cm

d.

45 cm

## Question number: 6

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

MCQ▾

### Question

A convex lens of the focal length 22 cm is placed in front of a plane mirror at a distance 32 cm from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object?

### Choices

Choice (4) Response

a.

11 cm and on the opposite side of the mirror

b.

11 cm and between the mirror and the lens

c.

22 cm and between the mirror and the lens

d.

22 cm and on the opposite side of the mirror

## Question number: 7

» 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

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