Determine the maximum angle ? for which the light rays incident on the end of th

Question

Determine the maximum angle ? for which the light rays incident on the end of the light pipe in the figure below are subject to total internal reflection along the walls of the pipe. Assume the light pipe has an index of refraction of 1.39 and the outside medium is air.

Determine the maximum angle ? for which the light rays incident on the end of the light pipe in the figure below are subject to total internal reflection along the walls of the pipe. Assume the light pipe has an index of refraction of 1.39 and the outside medium is air.

Explanation / Answer

C = sin^-1(1/u) = 46

1*sintheta = 1.39*sin(90-46)

theta = 74.5 degrees

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