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Q.

The focal length of objective of a telescope is 50 cm and eye-piece is 5 cm. The telescope is focused from a distinct vision on a scale 2 m away. The separation between the objective and the eyepiece is, if final image is formed at the least distance of distinct vision,

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An Intiative by Sri Chaitanya

a

75 cm

b

60 cm

c

71 cm

d

74 cm

answer is C.

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Detailed Solution

L=Vo+ue1V0−1u0=1f0,1Ve−1ue=1fe1V0=150−1206,1−25−1ue=15V0=2003cm,ue=−256cmL=2003+256⇒L=70.83=71cm

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