QUIZ#!#REFRACTION#!#PRISM#!#TIR#!#MOST EXPECTED QUESTIONS

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The refractive index of the material of a prism of refracting angle 45^@ is 1.6 for a certain monochromatic ray. What will be the minimum angle of incidence of this ray on the prism so that no TIR takes place as the ray comes out of the prism.