A beam of light is to undergo total internal reflection through a 45o 90o 45o prism (Fig.

Question:

A beam of light is to undergo total internal reflection through a 45o €“ 90o €“ 45o prism (Fig. 22.27).

(a) Will this arrangement depend on (1) the index of refraction of the prism, (2) the index of refraction of the surrounding medium, or (3) the indices of refraction of both? Explain.
(b) Calculate the minimum index of refraction of the prism if the surrounding medium is air. Repeat if it is water.