The length of a telescope is 2.20 m and the focal length of the eyepiece is 1.9 cm. What is the focal length of the objective?
A) 41 cm
B) 45 cm
C) 111 cm
D) 218 cm
E) 16 cm

Question

Quizplus · Accepted Answer

The length of the telescope is the sum of the focal lengths of the objective and the eyepiece. Convert the eyepiece focal length to meters: 1.9 cm = 0.019 m. Therefore, the focal length of the objective is 2.20 m - 0.019 m = 2.181 m or 218 cm.

The Length of a Telescope Is 2