Chapter 38415P38.17By Rayleigh’s criterion, two dots separated center-to-center by 2.00 mm would overlapwhenθλmin.==dLD1 22.Thus,LdD==×××=−−−1 222 00104 00101 22 5001013 1339.....λmmmmejejej.P38.18D==××=−−1 221 22 5 00101 00106 1075.....minλθejmcm*P38.19The concave mirror of the spy satellite is probably about 2 m in diameter, and is surely not morethan 5 m in diameter. That is the size of the largest piece of glass successfully cast to a precise shape,for the mirror of the Hale telescope on Mount Palomar. If the spy satellite had a larger mirror, itsmanufacture could not be kept secret, and it would be visible from the ground. Outer space isprobably closer than your state capitol, but the satellite is surely above 200-km altitude, forreasonably low air friction. We find the distance between barely resolvable objects at a distance of200 km, seen in yellow light through a 5-m aperture:yLDy==×FHGIKJ=
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Spy satellite, Hale telescope, Palomar Observatory, barely resolvable objects, Mount Palomar