This reected beam is visible on the back surface of

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Unformatted text preview: s. Your results should agree with your results from Section 4. Here, we will use Brewster’s Angle to determine the index of refraction. Notice that as you shine the green laser through the semicircular acrylic block, part of the laser is reflected back from the face of the block. This reflected beam is visible on the back surface of the laser pan. Notice there is a strip of grey material placed in front of this back wall. This material is a linear polarizer. 4 Change the angle of incidence of the laser until the reflected beam on the laser pan wall behind the polarizer becomes very dim or disappears. This will occur at Brewster’s Angle. Record this angle, θB . Use Equation 3 to determine the index of refraction of the acrylic. Does your measurement of Brewster’s angle agree with your measurement of the index of refraction of acrylic? 6 Experiment: Total Internal Reflection An interesting property of Equation 2 is that for light traveling inside a medium having a large index of refraction, for large angles of incidence to the boundary, no light leaves the medium. This is called total internal reflection. The angle where this just occurs is called the c...
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This document was uploaded on 02/15/2014.

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