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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
25
Optical Instruments
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25-1: Camera
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25-2: Eye and Corrective Lenses
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25-3: Magnifying Glass
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25-4: Telescopes
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25-5: Microscopes
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25-6: Lens Aberrations
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25-7 to 25-9: Resolution Limits
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25-11: X-Ray Diffraction
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25-12: Imaging by Tomography
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 31
Q

What is the magnification of an astronomical telescope whose objective lens has a focal length of 82 cm, and whose eyepiece has a focal length of 2.8 cm? What is the overall length of the telescope when adjusted for a relaxed eye?

A
-29X, 85 cm
Giancoli 7th Edition, Chapter 25, Problem 31 solution video poster
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COMMENTS
By theovilous on Sat, 4/13/2019 - 12:41 AM

Just wanted to let you know that there is a typo. For the value of magnification, the quick answer is "-2.9X" but the answer from the video is "-29X." Thank you for your awesome video!

By Mr. Dychko on Wed, 4/24/2019 - 4:44 PM

Hi Theovilous, thank you very much for spotting that! I've corrected it. Thanks also for letting me know the videos are helping with your studies. Keep it up!

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