What should be the resolution of the optical device to distinguish the phases of Venus at its minimum distance from the Earth

What should be the resolution of the optical device to distinguish the phases of Venus at its minimum distance from the Earth 4 • 10 ^ 7 km? The diameter of Venus is 12,000 km.

decision
q = 206 265 “/ D
q = 12000 * (2 * 10 ^ 5) “/ 4 * 10 ^ 7 = 60”

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