Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 35 - Optical Instruments - Conceptual Questions - Page 1016: 7


(a) smaller (b) larger (c) smaller (d) larger

Work Step by Step

We can write an expression for the width of the spot: $w = \frac{2.44~\lambda~f}{D}$ (a) Decreasing the wavelength of the light decreases the value of $w$ (b) Decreasing the lens diameter $D$ increases the value of $w$ (c) Decreasing the lens focal length $f$ decreases the value of $w$ (d) Decreasing the lens-to-screen distance causes the lens to move farther from the focal point. This increases the value of $w$
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