The length of a telescope is 2.00 m and the focal length of the objective lens is 2.0 cm. What is the focal length of the eyepiece?
A) 202 cm
B) 2.0 cm
C) 101 cm
D) 200 cm
E) 198 cm

Question

Quizplus · Accepted Answer

The focal length of the eyepiece can be found using the formula for the length of the telescope, which is the sum of the focal lengths of the objective lens and the eyepiece: $L = f_{objective} + f_{eyepiece}$. Given $L = 2.00 m = 200 cm$ and $f_{objective} = 2.0 cm$, solving for $f_{eyepiece}$ gives $f_{eyepiece} = 200 cm - 2 cm = 198 cm$.

The Length of a Telescope Is 2