a.) What is the maximum number of lines per centimeter a diffraction grating can have and produce a complete first-order spectrum for visible light? (Assume that the range of visible wavelengths of light in air is 380 - 760 nm.)
b.) What is the minimum diameter mirror on a telescope that would allow you to see details as small as 5.25 km on the moon some 384000 km away? Assume an average wavelength of 575 nm for the light received.