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  4. Four lenses of focal length ±15 cm and ± 150 cm are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be

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Q. Four lenses of focal length $\pm$15 cm and $\pm$ 150 cm
are available for making a telescope. To produce
the largest magnification, the focal length of the
eyepiece should be

AIPMTAIPMT 1994

Solution:

Magnifying power of telescope, $M= f_o /f_e $
To produce largest magnifications $ f_o> f_e \, \, and \, \, f_0$
and $ f_e $ both should be positive (convex lens)
Therefore $ f_e = +15 cm $