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Q.

The focal length of the objective and the eyepiece of a telescope are 50cm and 5cm respectively.  If the telescope is focussed for distinct vision on a scale distant 2m from its objective, then its magnifying power will be :

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a

-4

b

-8

c

+8

d

-2

answer is D.

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Detailed Solution

u0=-200 cm ; 1f=1v0-1u0 150=1v0-1-200 v0=2003cm, m0=-200/3200=131fe=1ve-1ue⇒ve=-25 cm ue=-256cm, fe=5cm, me=-25-25/6=6 m=m0me ; m=-13 x 6=-2
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