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Solution :

We known that speed of laser light `= c = 3xx10^(8) m//s`. If d be the distance of Moon from the earth, the time taken by laser signal to return after reflection at the Moon's surface <br> `t=2.56 s=(2d)/c=(2d)/(3xx10^(8) ms^(-1))` <br> `implies d=1/2xx2.56xx3xx10^(8) m=3.84xx10^(8) m`.