First slide

The optical instruments

Question

If both the object and image are at infinite distances form a refracting telescope its magnifying power will be equal to

Moderate

A

The sum of the focal lengths of the objective and the eyepiece
B

The difference of the focal lengths of the two lenses
C

The ratio of the focal length of the objective and eyepiece
D

The ratio of the focal length of the eyepiece and objective

Solution

In case of a telescope if object and final image are at infinity then $m = \frac{f_{0}}{f_{e}}$

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