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A 40 cm telescope has a focal ratio of f/10.
a) What is the light-gathering power of this telescoperelative to that of a single human eye? Use a pupil diameter of 7 mm.
b) What is the diffraction-limited angular resolution (inarc-seconds) of this telescope for a wavelength of 480 nm?
c) What would be the focal length (in mm) of the eyepiecenecessary to achieve a magnification of 200 with this telescope?

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