Answer
Zero.
Work Step by Step
The ray passes through the boundary without changing direction. If the angle of incidence is zero degrees. Snell’s law shows that the angle of refraction is also zero.
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 23 - Light: Geometric Optics - Questions - Page 671: 8
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