Ray and Wave Optics — Practice

Question 1

A concave mirror has a radius of curvature of 20 cm. Its focal length is

Accepted Answer

A

Question 2

The speed of light in a medium is 2 × 10⁸ m/s. The refractive index of the medium is (c = 3 × 10⁸ m/s)

Accepted Answer

A

Question 3

The speed of light in a medium of refractive index 1.5 is (c = 3 × 10⁸ m/s)

Accepted Answer

A

Question 4

The critical angle for a medium of refractive index 2 (relative to air) is

Accepted Answer

A

Question 5

Total internal reflection occurs when light travels

Accepted Answer

A

Question 6

The power of a convex lens of focal length 20 cm is

Accepted Answer

A

Question 7

A converging lens is

Accepted Answer

A

Question 8

Two thin lenses of powers +5 D and +3 D are placed in contact. The power of the combination is

Accepted Answer

A

Question 9

In a Young's double-slit experiment, λ = 600 nm, slit separation d = 1 mm and screen distance D = 1 m. The fringe width is

Accepted Answer

A

Question 10

Myopia (short-sightedness) is corrected using a

Accepted Answer

A

Question 11

Hypermetropia (long-sightedness) is corrected using a

Accepted Answer

A

Question 12

When white light passes through a prism, the colour that deviates the most is

Accepted Answer

A

Question 13

In reflection at a plane surface, the angle of incidence is 30°. The angle of reflection is

Accepted Answer

A

Question 14

The phenomenon of polarisation shows that light is

Accepted Answer

A

Question 15

The image formed by a convex mirror of a real object is always

Accepted Answer

A

Practice — Ray and Wave Optics