Question

A giant refracting telescope at an observatory has an objective lens of focal length $15\, m$. If an eye piece of focal length $.0 \,cm$ is used, what is the angular magnification of the telescope?

• A. $1000$
• B. $1500$
• C. $2000$
• D. $3000$

Answer 1

Answer: (B)

$1500$

Answer 2

Here, $f_0 = 15 m\, = 15 \times 10^2 \,cm$, $f_e = 1.0 \,cm$ $\therefore$ magnification, $m = \frac{f_0}{f_e}$ $= \frac{15\times 10^2}{1} = 1500$