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A grade school student plans to build a 35 -power telescope as ascience fair project. She starts with a magnifying glass with a focallength of 7.5 $\mathrm{cm}$ as the eyepiece. What focal length is needed forher objective lens?

$=3.6 \mathrm{~m}$

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

University of Washington

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Hope College

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So in this problem, we have until the school with a total magnification. That's called M of 35 times, and this telescope uses on eyepiece lens with a focal length. Let's call the focal eyepiece off 7.5. Same team enters, and we want to discover difficult, objective lens. Well, we know that's by definition, magnification is just the focal objective divided by the focal eyepiece. Therefore, we can we can just corporal weekend describe that the focal objective is just the magnification times, bifocal eyepiece. So this is going to be equal to Let's see the focal objective in Kloster dirty five times judo 0.7 five. So this is just to a point six meters, and that's the answer to this problem. Thanks for watching.

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