Question

The critical angle for glass is 42°. The corresponding angle of refraction is:

विकल्प

• 0°

• 90°

• lesser than 90° but more than 42°.

• no angle of refraction.

Answer 1

90°

Explanation:

At the critical angle, the angle of refraction in the rarer medium is 90°, so the refracted ray travels along the boundary.