The objective lens of a refracting astronomical telescope has a focal length of 60 cm,and the eyepiece has a focal length of 2.0 cm.How far apart should the lenses be placed in order to form a final image at infinity?
A)44 cm
B)58 cm
C)76 cm
D)60 cm
E)62 cm

Question

Quizplus · Accepted Answer

To form a final image at infinity, the distance between the objective lens and the eyepiece should be equal to the sum of their focal lengths. Therefore, 60 cm + 2 cm = 62 cm.

The Objective Lens of a Refracting Astronomical Telescope Has a Focal