The Total solution for NCERT class 6-12
A prismis made of glass of unknown refractive index. A parallel beam of light isincident on a face of the prism. The angle of minimum deviation is measured tobe 40°. What is the refractive index of the material of the prism? Therefracting 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 aparallel beam of light.
Angle of minimum deviation, = 40°
Angle of the prism, A = 60°
Refractive index of water, µ =1.33
Hence, the refractiveindex of the material of the prism is 1.532.
The refractive index ofglass with respect to water is given by the relation:
Hence,the new minimum angle of deviation is 10.32°.