ch36-p094 - 94 We denote the Earth-Moon separation as L The...

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94. We denote the Earth-Moon separation as L . The energy of the beam of light which is projected onto the moon is concentrated in a circular spot of diameter d 1 , where d 1 / L = 2 θ R = 2(1.22 λ / d 0 ), with d 0 the diameter of the mirror on Earth. The fraction of energy picked up by the reflector of diameter d 2 on the Moon is then η ' = ( d 2 / d 1 ) 2 . This reflected light, upon reaching the Earth, has a circular cross section of diameter d 3 satisfying d 3 / L = 2 R = 2(1.22 λ / d 2 ). The fraction of the reflected energy that is picked up by the telescope is then
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