The magnifying power of a telescope is 9 . When it is adjusted for ...

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The magnifying power of a telescope is 9 . When it is adjusted for parallel rays the distance between the objective
\( \mathrm{P} \) and eyepiece is \( 20 \mathrm{~cm} \). The focal length of lenses are:

W
(2012 Pre)
(a) \( 10 \mathrm{~cm}, 10 \mathrm{~cm} \)
(b) \( 15 \mathrm{~cm}, 5 \mathrm{~cm} \)
(c) \( 18 \mathrm{~cm}, 2 \mathrm{~cm} \)
(d) \( 11 \mathrm{~cm}, 9 \mathrm{~cm} \)
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