How is the value of angle of refraction greater than 90 degrees in full internal reflection ?

How is the value of angle of refraction greater than 90 degrees in full internal reflection ?
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Answer :

The angle of inclination of the density medium for which the value of its angle of refraction is 90 degrees is called the angle of incidence. If the value of the angle of refraction is not more than 90 degrees then there will be no full internal reflection. Thus the value of full internal reflection is more than 90 degrees.
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