The telescope at a small observatory has objective and eyepiece focal lengths respectively of 20.0 m and 12 cm. If this telescope is used to view a 1620 m diameter lunar crater on the surface of the moon 3.77 108 m
from the surface of the Earth, determine the following.
(a) angular magnification of the telescope
(b) size of the first image
m
(c) length of the barrel of the telescope
m
(d) angle subtended at the unaided eye by the lunar crater
rad
(e) angle subtended at the eye when the lunar crater is viewed through the telescope
rad