Question

Define Critical angle

Answer 1

Hello !
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the angle of incidence that provides an angle of refraction of 90-degrees. the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees.
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Answer 2

Heyaa folk,

Guy this don't mean, I don't upload picture but it is helpful.
Like to give a image but, I'm unable to do this. Anyway, hope You will mark my answer as brainliest !

Okk,

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First you want to know the definition,

■ CRITICAL ANGLE ■

# The angle of a incidence beyond which rays of light passing through a denser medium to the surface of less denser medium are no longer refracted but totally reflected.

# so, the critical angle is defined as :
The angle of incidence that provides an angle of refraction 90°.

{ NOTE : consider 90° as 90 degrees }

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