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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
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.
- Spring '14