question_answer 6)

A prism is made of glass of unknown refractiveindex. A parallel beam of light is incident on aface of the prism. By rotating the prism, theangle of minimum deviation is measured to be40°. What is the refractive index of thematerial of the prism ? If the prism is placed in water (refractive index 1.33), predict the newangle of minimum deviation of a parallel beam of light. The refracting angle of the prism is60°. 

Answer:

Usingwe get When the prism is placed in water, then oror