Question: A high-powered laser beam (Î» = 600 nm) with a beam diameter of 12 cm is aimed at the Moon, 3.8 x 105 km distant.

A high-powered laser beam (Î» = 600 nm) with a beam diameter of 12 cm is aimed at the Moon, 3.8 x 105 km distant. The beam spreads only because of diffraction. The angular location of the edge of the central diffraction disk (see Eq. 36-12) is given by

Where d is the diameter of the beam aperture. What is the diameter of the central diffraction disk on the Moon's surface?

sin -1.22A

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