Question

define critical angle of incidence​

Answer 1

Answer:

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:

Hey dude, here's your answer:-

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

Explanation:

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