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# Question 6: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

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Question 6: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

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.

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### 1 Answer

1. Solution:
When the light beam is incident from air on to the glass prism, the angle of minimum deviation is 40°. Refractive index of glass w.r.t. air.

Now the prism is placed in water, new angle of minimum deviation can be calculated.

Check the complete chapter with solutions.NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments