Question

The linear magnification is produced by a telescope having an objective of 50 cm and eyepiece of 5 cm focal length when used to read a scale 3m away is

Answer 1

Answer: The correct answer is 10.

Explanation:

The expression for the linear magnification produced by a telescope is as follows;

$m= \frac{f_{0} }{f_{e}}$

Here, $f_{0}$ is the focal length of the objective lens and  $f_{e}$ is the focal length of the eyepiece lens.

It is given in the problem that the linear magnification is produced by a telescope having an objective of 50 cm and eyepiece of 5 cm focal length

Put  $f_{0}= 50 cm$ and  $f_{e}= 5 cm$ in the above expression.

$m= \frac{50  }{5}$

$m= 10$

Therefore, the linear magnification of the telescope is  10.