Question

42. A ray of light is travelling from air to water. What is the angle of incidence in air, if angle
of refraction in water is 45°? Take refractive index of water = 1.32.​

Answer 1

Answer:

it is rarer...in air or vaccumm but in glass oil or water it is less denser

Answer 2

Answer:

68.4 degree

Explanation:

we know that η=$\frac{sini}{sinr}$   ----(1)

given r=45° η of  water=1.32

put value of r and refractive index in equation 1 and you will get the answer.

hope it helps