Question: If a camera with a 50-mm lens is to resolve two objects that are 4.0 mm from each other and both objects are 3.5 m

If a camera with a 50-mm lens is to resolve two objects that are 4.0 mm from each other and both objects are 3.5 m from the camera lens,
(a) What is the minimum diameter of the camera lens?
(b) What is the resolving power? (Assume the wavelength of light is 550 nm.)

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