20. (a) Using the notation of Sample Problem 36-3, the minimum separation is DLLd==FHGIKJ=××≈−θRmmmm.122400 10122 550 100 0055039...λchbgbg(b) The Rayleigh criterion suggests that the astronaut will not be able to discern the Great Wall (see the result of part (a)). (c) The signs of intelligent life would probably be, at most, ambiguous on the sunlit half
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