A giant refracting telescope at an observatory has an objective lens of focal length $15\text{ m}$. If an eyepiece of focal length $1.0\text{ cm}$ is used, what is angular magnification of the telescope in normal adjustment?

1,500

The correct answer is Option (3) → 1,500 ##

Given $f_o = 15\text{ m}, f_e = 1\text{ cm} = 0.01\text{ m}$

Angular magnification of the telescope $M = \frac{f_o}{f_e}$

$= \frac{15}{0.01} = 1500$