Question: The beam emerging from a ruby laser passes through a circular aperture 5.0 mm in diameter. (a) If the spread of the beam is limited

The beam emerging from a ruby laser passes through a circular aperture 5.0 mm in diameter.
(a) If the spread of the beam is limited only by diffraction, what is the angular spread of the beam?
(b) If the beam is aimed at the Moon, how large a spot would be illuminated on the Moon's surface?

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