Looking toward the Moon with a telescope, you want to be able to see a crater that is 100 km wide. If the distance from the Earth's surface to the Moon's surface is 3.8 × 108 m, how wide must your telescope aperture diameter be in order to see the edges of the crater clearly? Assume that white light is reflected off the Moon (?avg = 550 nm).

A.

2.5 mm

B.

6.7 cm

C.

2.1 mm

D.

1.4 cm

E.

4.5 cm

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