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Solve the following problems on refractive index. Show GIVEN & REQUIRED values and
complete solution including relevant FORMULA/S. Box and round off final answer to TWO
decimal places if needed.
Find the critical angle of light passing from ethanol (n=1.36) into air.

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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 1.40 and the outside medium is air.