Answer :

Refractive index of glass is


Refractive index of air is


Angle if incidence = i


29.PNG


Critical Angle=


So,





The angle of deviation due to refraction from glass to air increases as the angle of incidence increases from 0° to 40°48''. The angle of deviation due to total internal reflection further increases for 40°48'' to 45° and then it decreases, as shown in the above graph.


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