The World's Largest Refracting Telescope Is Operated at the Yerkes

question 2

Short Answer

The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m. Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens?
(Assume an average wavelength of 0.55 μm for white light.)