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8. A laser beam has wavelength of 7200 A and aperture 5 x 103. The laser beam is sent to moon at a distance 4

8. A laser beam has wavelength of 7200 A and aperture 5 x 103. The laser beam is sent to moon at a distance 4 x 103 m from the earth. Determine angular spread and radius of spread when it reaches the moon

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