The length of the telescope is 1.60 m,and it has a magnification of 60.0.What is the focal length of the objective lens?
A)60.0 cm
B)157 cm
C)100 cm
D)128 cm
E)96.0 cm

Question

Quizplus · Accepted Answer

Magnification, M = (-) fo/fe
Given, M = 60
Length of telescope, L = 1.60 m = 160 cm

Now, using the formula,
L = fo + fe
We get,
fe = L - fo

Substituting the value of M and solving the above two equations,
we get,
fo = 157 cm. 
Hence, the answer is (B).

The Length of the Telescope Is 1