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Q.

An astronomical telescope has an angular magnification of magnitude 5 for distance objects.  The separation between the objective and the eye-piece is 36cm and the final image is formed at infinity. The focal length fo of the objective and the focal length fe of the eye-piece are

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a

fo=45  cm  and  fe=9cm

b

fo=7.2  cm  and  fe=5cm

c

fo=50  cm  and  fe=10cm

d

fo=30  cm  and  fe=6cm

answer is D.

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Detailed Solution

L=f0+fe and M=f0fe....and for astronomical telescope the magnifying power is negative and both of lenses used are convex

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