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A cell phone has a camera with a lens diameter D = 3mm and a focal...

A cell phone has a camera with a lens diameter D = 3mm and a focal length of f = 4.25mm. (1mm = 10−3m.) For this problem take the wavelength of light to be 500 nm (5 × 10−7) m. Assume the sensor in the phone is 5mm x 5mm and that each pixel has a size of 2μm x 2μm. (1μm = 10−6m.)

what is the angular size of a pixel if the camera is focused on a object far away?

what is the diffraction limit for the cell angular resolution?

Thanks in advance!

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