The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of 10.0 cm.
(a) What is the angular magnification of the telescope?
(b) If the telescope is used to look at a lunar crater (diameter = 1050 m), what is the size of the first image, assuming the surface of the moon is 3.77 Ã- 108 m from the surface of the earth?
(c) How close does the crater appear to be when seen through the telescope?