Question

3. when a light ray approaches a glass air interface from the glass side at the critical angle, the angle of refraction is

Answer 1

Explanation:

angle of incidence is always opposite to angle of refraction

Answer 2

Explanation:

ANSWER

When the angle of incidence reaches a value known as the critical angle the refracted rays travel along the surface of the medium or in other words are refracted to an angle of 90°

Hence the option C is the right answer