Question: Spy planes fly at extremely high altitudes (25 km) to avoid interception. Their cameras are reportedly able to discern features as small as 5 cm.

Spy planes fly at extremely high altitudes (25 km) to avoid interception. Their cameras are reportedly able to discern features as small as 5 cm. what must be the minimum aperture of the camera lens to afford this resolution? (Use λ = 550 nm.)

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