University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 33 - The Nature and Propagation of Light - Problems - Discussion Questions - Page 1104: Q33.15


The plastic becomes a polarizer when it is stretched.

Work Step by Step

The wrap is roughly isotropic when it is relaxed. When it is stretched, the molecules preferentially orient along the stretched direction and it becomes a linear polarizer. The wrap rotates the plane of polarization of the light that passes through the first polarizer, allowing some of the light to pass through the final polarizer.
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