A telescope is constructed from two lenses with focal lengths of 90.0cm and 20.0cm , the 90.0?cm lens being used as the objective. Both the object being viewed and the final image are at infinity.
Find the angular magnification for the telescope.
Find the height of the image formed by the objective of a building 60.0 m tall, 3.50km away.
What is the angular size of the final image as viewed by an eye very close to the eyepiece?