question_answer

The focal length of the objective and the eyepiece of a telescope are 50 cm and 5 cm respectively. If the telescope is focused for distinct vision on a scale distant 2m from its objective, then its magnifying power will be: [JEE ONLINE 22-04-2013]

A) \[-4\]

B) \[-8\]

C) \[+8\]

D) \[-2\]

Correct Answer: D

Solution :

[d] Given:

Magnification M =?

As

or

Now

From,

or,

Magnification