A narrow beam of light is incident on a prism as sketched in the picture above. The angle of the beam with the surface is beta. The top angle of the prism is alpha. After refraction, the beam continues along the horizontal axis. The index of refraction of air is n=1; the index of refraction of the prism is n’ . What is the relation between alpha and beta (equation)? Next, the prism is immersed in water with index of refraction n’’ < n’ . The beam again has the same angle of incidence. What direction does the beam have when it exits the prism on the right side?

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