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By measuring the go-and-return time for a laser pulse to travel from an Earth-bound observatory to a reflector on the Moon, it is possible to measure the separation between these bodies.

(a) What is the predicted value of this time?

(b) The separation can be measured to a precision of about 21 cm. To what uncertainty in travel time does this correspond?

(c) If the laser beam forms a spot on the Moon 4.22 km in diameter, what is the angular divergence of the beam? Give Your answers with units please?

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