Q. A small telescope has an objective lens of focal length $144 c m$ and an eyepiece of focal length $6 c m .$ The magnifying power of the telescope is

1866 214 Ray Optics and Optical Instruments Report Error

A

4.2

22%

B

24

46%

C

138

16%

D

150

17%

Solution:

$m = \frac{f _{o}}{f _{e}} = \frac{144}{6} = 24$ .