A tiny laser beam is directed from earth to moon.If the beam is to have a diameter of 2.50m at the moon,how small divergence angle be for the beam? The moon from the earth is 3.8x10^.

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Draw a diagram with the distance between the earth and moon as adj side and the radius as opp side and find the tan inverse , it gives you the half the angle. Doubling it will give you the angle.