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  4. 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?

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Q. 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?

Ray Optics and Optical Instruments

Solution:

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$