NCERT Exercise 9.6 - Ray Optics and Optical Instruments
Question: A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.
Answer: **NCERT answer:** n ≅ 1.53 and Dm for prism in water ≅ 10°
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