A surveillance satellite is placed into a circular orbit at 500 km altitude at 55 inclination. Its telescope has a field of view of 2 along-track and 2 cross-track. The ground resolution is 0.2 m per pixel. The detector has the dimensions 5 cm 5 cm (hence, assume the radius of the detector to be 2.5 cm). What is the focal length of the instrument? If the telescope is optimized for a wavelength of 500 nm, what is the aperture diameter for the required ground resolution