Aspy satellite circles the earth at an altitude of 212 km and carries out surveillance with a special high-resolution telescopic camera having a lens diameter of 20 cm. if the angular resolution of this camera is limited by diffraction, estimate the separation of two small objects on the earth's surface that are just resolved in yellow-green light =550 nm). use the small-angle approximation for this problem.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. the ice dissolves oxygen from the air, forming a denser crystalline matrix. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.