A Camera with a 20-Cm Diameter Lens Is Recording Images

Short Answer

A camera with a 20-cm diameter lens is recording images using a filter that allows only light of wavelength 600 nm to pass through.
(a) What is the limit on the angular resolution (in microradians) in this case?
(b) What is the diameter of the minimum-sized features that could be resolved on Mars with this camera? The distance to Mars at the time is 9.0 × 10⁷ km.