The beam emerging from a ruby laser wavelength 6943 nm


The beam emerging from a ruby laser (wavelength 694.3 nm) passes through a circular aperture 2.4 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?

km

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Physics: The beam emerging from a ruby laser wavelength 6943 nm
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