Question

A ray of light travelling in air falls obliquely on the surface of a calm pond. It will
(A) Go into the water without deviating from its path
(B) deviate away from the normal
(C) Deviate towards the normal
(D) turn back on its original path​

Answer 1

C)A ray of light travelling in air falls obliquely on the surface of a calm pond. It will bend towards the normal because the ray is travelling from rarer to denser medium.

Answer 2

Answer:

(C) Deviate towards the normal.

Explanation:

• If a ray strikes any surface of different media ( rarer to denser) then it bends towards the normal as the speed of light decreases when it enters from the rarer medium due to molecular arrangement.
• If a ray enters from a denser to a rarer medium then it bends away from the normal as speed increases in this case.
• The refractive index is the measure of bending of a light ray when passing from one medium to another. It can also be defined as the ratio of the velocity of a light ray in an empty space to the velocity of light in a substance, n = c/v
• When light enters from one medium to another, the wavelength and velocity of the light changes though the frequency remain the same.