Ray Optics (NEET Physics): Questions 21 - 26 of 102

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Question number: 21

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

Two plane mirrors are inclined at an angle θ. A ray of light is incident on one mirror at an angle of incidence i. The ray is reflected from this mirror, falls on the second mirror from where it is reflected parallel to the first mirror. What is the value of i, the angle of incidence in terms θ?

Choices

Choice (4) Response
a.

3θ - 90°

b.

2θ - 90°

c.

θ - 90°

d.

4θ - 90°

Question number: 22

» Ray Optics » Reflection and Refraction of Light » Smooth Surface

MCQ▾

Question

An air bubble in water acts as,

Choices

Choice (4) Response
a.

A divergent lens

b.

A convergent lens

c.

A plane mirror

d. None of the above

Question number: 23

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

Find the number of images formed by two mutually perpendicular mirrors -

Choices

Choice (4) Response
a.

2

b.

4

c.

1

d.

3

Question number: 24

» Ray Optics » Snell's Law

MCQ▾

Question

A ray of light is incident on a transparent glass-slab of refractive index 1.5. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

Choices

Choice (4) Response
a.

tan132

b.

sin123

c.

30 0

d.

tan123

Question number: 25

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

MCQ▾

Question

A 35 mm film is to be projected on a 20 m wide screen situated at a distance of 40 m from the film-projector. Calculate the focal length of projection lens.

Choices

Choice (4) Response
a.

20 mm

b.

40 mm

c.

35 mm

d.

70 mm

Question number: 26

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

The angle θ between two plane mirrors producing five images of a given object is given by.

Choices

Choice (4) Response
a.

15° < θ < 72°

b.

60° < θ < 72°

c.

30° < θ < 72°

d.

45° < θ < 72°

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