A student constructs an astronomical telescope and wishes it to have a magnification of 10.If the telescope has an objective lens of focal length 0.50 m,what must be the focal length of the eyepiece?
A)2.5 cm
B)5.0 cm
C)10 cm
D)25 cm

Question

Quizplus · Accepted Answer

The magnification of a telescope is given by the ratio of the focal length of the objective lens to the focal length of the eyepiece. Therefore, we have:

Magnification = Focal length of objective lens / Focal length of eyepiece

10 = 0.50 / Focal length of eyepiece

Focal length of eyepiece = 0.50 / 10 = 0.05 m = 5 cm

Therefore, the answer is B.

A Student Constructs an Astronomical Telescope and Wishes It to Have