Question: We wish to use the 15-cm-diameter objective from an amateur telescope to form an image on a CCD of a distant star. Assuming a mean

We wish to use the 15-cm-diameter objective from an amateur telescope to form an image on a CCD of a distant star. Assuming a mean wavelength of 540 nm and a focal length of +140 cm, determine the size of the resulting Airy disk. How would that change if we doubled the lens diameter, keeping all else constant?

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