Question

what is critical angle??​

Answer 1

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• 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

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 critical angle.....

this is the right answer

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