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Question: 

Estimate the angular spread of a laser beam due to diffraction if the beam emerges through a 3.0-mm-diameter mirror. Assume that $\lambda$ = 694 nm. What would be the diameter of this beam if it struck

  1. a satellite 340 km above the Earth, or
  2. the Moon? [Hint: See Sections 24–5 and 25–7.]

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 
  1. $190 \textrm{ m}$
  2. $220 \textrm{ km}$

Giancoli 7th Edition, Chapter 28, Problem 44

(2:19)

Chapter 28, Problem 44 is solved.

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