The focal length for light that strikes near the center of a spherical convex lens is 15

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The focal length for light that strikes near the center of a spherical convex lens is 15 cm. Referring to Figure 27-23, will the focal length for light that strikes near the edge of the lens be greater than, less than, or equal to 15 cm?
In figure 27-23
focuses light at different points.
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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