Dear Student, Let KLM be ABC of the prism If iC is the critical angle for the prism/material, μ=1sin iCsin iC=1μ=32iC=60°Angle of incidence at the face of the prism=60°Hence, refracted ray grazes the surface ACAngle of emergence=90°Angle of deviation=30° Regards

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Dear Student,
Let KLM be ABC of the prism.

If i_{C} is the critical angle for the prism / material, μ = \frac{1}{\sin i_{C}} \sin i_{C} = \frac{1}{μ} = \frac{\sqrt{3}}{2} i_{C} = 60 ° Angle of incidence at the face of the prism = 60 ° Hence, refracted ray grazes the surface AC Angle of emergence = 90 ° Angle of deviation = 30 °

Regards

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