Question

1. For total internal reflection in a glass slab .kept in air
A. the light ray is incident at 90° to the surface of the glass medium.
B. the critical angle is 90° and is measured in air.
C. the critical angle is measured in glass for which the angle of refraction in air is 90°
D. the light ray is incident at 09 to the surface of the glass medium.​

Answer 1

Explanation:

a is right WP do DJ CNN Choo

Answer 2

Answer

A is a right answer