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Question 1 1 pts abc is an isosceles right-triangle prism in air. An incident ray is perpendicular to the ab side. The transmitted ray from the back side (bc) has an angle of a = 150 with the direction of the incident ray. What is the index of refraction of the prism? 45 CAn equilateral triangle abc prism rests on a table. A light ray makes an incident angle of B at the ab surface. The index of refraction of the prism is 1.5. What is the smallest angle of B, for which the light ray will exit from the bc surface? Unit of B is in degree. 60 a C O 21\fA light beam strikes a piece of glass with an incident angle of 450. The beam contains two colors: 600 nm and an unknown wavelength. The index of refraction for the 600-nm light is 1.8. Assume the glass is surrounded by air, which has an index of refraction of 1. What is the index of refraction nu for the unknown wavelength if its refraction angle is 70 smaller than that of the 600 nm light. O 2.8 O 1.9 O 1.4 O 2.5 O 2.2 O 1.7