Ray Optics | Quiz-01

The critical angle for a pair of medium and air is 30°. The speed of light in the medium is-

(A) 1 x 10⁸ m/s
(B) 1.5 x 10⁸ m/s
(C) 2.2 x 10⁸ m/s
(D) 2.2 x 10⁸ m/s

The refractive index of air w.r.t. glass is 2/3. The refractive index of diamond w.r.t. air is 12/5. Then, the refractive index of glass w.r.t. diamond will be-

Assertion- The focal length of a lens does not change when red light is replaced by a blue light.
Reason- The focal length of a lens does not depend on the color of light used.

A beam of light travels from air into a medium. Its speed and wavelength in the medium are 1.5 x 10⁸ m/s and 230 nm respectively. The wavelength of light in air will be-

A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. The lens will behave as a-