PASCO WA-9316A Complete Microwave Optics System - Manual (Page 30)

Experiment Guide Experiment 11: Brewster’s Angle
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3. Without changing the angles between the transmitted beam, the Polyethylene Panel, and the Receiver, rotate both the
Transmitter and the Receiver horns so they align for vertical polarization (0°). Record the new meter reading in the table.
4. Repeat steps 2 and 3, setting the angle of incidence to each of the values shown in the table below. At each point set the
Transmitter and Receiver for horizontal polarization and record the meter reading; then set them for vertical polarization
and record that reading as well.
5. Plot a graph of “Meter Reading” versus “Angle of Incidence”. Plot both the vertical and horizontal polarizations on the
same graph. Label Brewster’s Angle—the angle at which the horizontally polarized wave does not reflect.
Questions
1. Explain how Polaroid sun-glasses can be used to reduce the glare caused by the sun setting over a lake or the ocean.
Should the glasses be designed to block vertically or horizontally polarized light?
2. Could you use the microwave apparatus to locate Brewster’s Angle by examining the transmitted wave rather than the
reflected wave? How?