Question

at the critical angle the angle of refraction is ____​

Answer 1

Answer:

Explanation:

90-degrees

When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur.

Answer 2

Answer:

90 degrees..............................