Question

The telescope at a small observatory has objective and eyepiece focal lengths respectively of 18.2 m and 12 cm. If this telescope is used to view a 2000 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

Answer 1