Answer
$0.134$
Work Step by Step
The required fraction of intensity can be determined as
$\frac{I}{I_{\circ}}=cos^2(68.5^{\circ})=0.134$
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 25 - Electromagnetic Waves - Problems and Conceptual Exercises - Page 903: 73
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