Question

A Newtonian telescope, which has an F/5 parabolic primary mirror with a diamter of 200 mm, is used to image the Moon. Find the radius of curvature of the mirror and the image size of the Moon in the focal plane if the angular size of the Moon is 0.5 deg

For the parabolic mirror in the previous problem, estimate the field curvature and determine whether one can use a flat detector to image the full Moon at the wavelength λ =0.6µm. (Hint: compare the depth of focus to the sag of the curved image surface).

Answer 1