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 = 694nm. What would

Estimate the angular spread of a laser beam due to diffraction if the beam emerges through a 3.0-mm-diameter mirror. Assume that λ = 694nm. What would be the diameter of this beam if it struck?
(a) A satellite 300 km above the Earth, or
(b) The Moon?

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