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 d1, where d1/L= 2θR= 2(1.22λ/d0), with d0the diameter of the mirror on Earth. The fraction of energy picked up by the reflector of diameter d2on the Moon is then η'= (d2/d1)2. This reflected light, upon reaching the Earth, has a circular cross section of diameter d3satisfying d3/L= 2R= 2(1.22λ/d2). The fraction of the reflected energy that is picked up by the telescope is then
This is the end of the preview. Sign up
access the rest of the document.