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The focal length for light that strikes near the center of aspherical convex lens is 15 $\mathrm{cm} .$ Referring to Figure $27-23,$ willthe focal length for light that strikes near the edge of the lens begreater than, less than, or equal to 15 $\mathrm{cm} ?$

less than 15 $\mathrm{cm} .$

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Simon Fraser University

Hope College

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Okay, so in this questions we have that the light rays they strikes near the center office. Vertical convex lens is 15. Think team enters, so we have the four co land off 15. Same team enters for the light race. There he is, near the center. So if we make a schematic drawing drawing here, we can see that the light races this strike near They grow virg toe a focus off 15. This is the position. 15 same team mentors, but the light race. They strike the lens near the edge, right on the edge of the lens. They have a much near Jeff, so they've the focus off this light race, but much closer. So the focus. It's a smaller than the focus off the light rays, the hit near the center of the convex lens. So the answer to this problem is that let's go F B, which is the focal lens off the light raise. The heat on the edge of the Comex lands is less then 15. Okay, always remember the half off the light race. And then, when the heat the edge e r deflect much more than the light rays hit in the center of the off the lens

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