HW11key

# HW11key - refraction of 1.36 and the outside medium is air...

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1 Homework 11 1. A laser beam with vacuum wavelength 632.8 nm (1nm = 10 -9 m) is incident from air onto a block of Lucite. The line of sight of the photograph is perpendicular to the plane in which the light moves. Use a protractor to measure the angles and find (a) the speed (b) the frequency (c) the wavelength of the light in the Lucite. 2. Determine the maximum angle θ for which the light rays incident on the end of the pipe are subject to total internal reflection along the walls of the pipe. Assume the pipe has an index of
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Unformatted text preview: refraction of 1.36 and the outside medium is air. By using a protractor, we know that Sin(angle of refraction) = 0.55, and sin(angle of incidence) = 0.84. so: (a) (b) (c) 8 8 sin( ) 0.55 ' 3 10 1.96 10 ( / ) sin( ) 0.84 refraction incidence c c m s θ = × = × × = × 8 14 9 3 10 4.74 10 ( ) 632.8 10 c f Hz λ-× = = = × × 8 14 ' 1.96 10 ' 414( ) 4.74 10 c nm f × = = = × 1 1 arcsin arcsin 0.73( ) 2 2 1.36 rad n π =-=-=...
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## This note was uploaded on 05/06/2008 for the course PHYS 1304 taught by Professor Ye during the Spring '08 term at SMU.

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