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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 55
Q

Two stars 18 light-years away are barely resolved by a 66-cm (mirror diameter) telescope. How far apart are the stars? Assume λ\lambda = 550 nm and that the resolution is limited by diffraction.

A
1.7×1011 m1.7 \times 10^{11} \textrm{ m}
Giancoli 7th Edition, Chapter 25, Problem 55 solution video poster
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COMMENTS
By ljn8 on Thu, 2/26/2015 - 4:50 AM

Correct me if I am wrong but doing this math out I got 1.7*10^12. I am not sure what the issue is.

By ljn8 on Thu, 2/26/2015 - 4:52 AM

Never mind I wrote 181 light years not 18. sorry!

By Mr. Dychko on Thu, 2/26/2015 - 6:06 PM

No need to apologize ljn8, we all make mistakes.

Cheers,
Mr. Dychko

By savannah.jpinkston on Wed, 4/12/2023 - 11:01 PM

Why do we not take tan^-1 of (l/r) for theta?

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