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10.40 Suppose that we have a laser emiting a diffractioa-limited beam (h 632.84 nm) with a 2-mm diameler. Haw big a lHght spot would be pro away from such a device? Neglect any effects of the Earths atmosphere ducedonthe surface ofthe Moon adistance of376× ?0, krn

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The wavelength (2) of laser beam 632.84 nm 632.84 x 10 m Diameter (d) of the beam at the aperture of the laser 2 mm -2 x103 nSize of the light spot on the surface of the Moon is given by 1.22 D2 (1.22) (376x10° m (632.84x10 m) 2x10 3m 145148.18m -1.4

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