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Jason has a 25 -power telescope whose objective lens has a focallength of 120 $\mathrm{cm} .$ To make his sister appear smaller than normal,he turns the telescope around and looks through the objective lens. What is the angular magnification of his sister when viewed through the "wrong" end of the telescope?

0.040

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

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Okay, so and this problem, Jason, looking from a telescope with, uh, magnification power off 25 times. But the problem is, Jason turned telescope around, so he reverse the roles off your objective in the eyepiece lens is. And when he do this, he actually inverting the magnification. So it's just one divided by mm. So the total magnification now off the telescope, it's one divided by 25 which is 0.4 And that's the answer to this problem. Thanks for watching.

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