Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 25 - Optical Instruments - Questions: 7

Answer

By squinting, you are letting light only through the center of your lens, where the two sides are the most parallel, i.e, where it is the flattest.

Work Step by Step

As discussed on page 719, your eye muscles relax to let you see faraway objects clearly. This makes your lens relatively flat (long focal length).
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