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Q.

Magnifying power of an astronomical telescope for normal adjustment is 10 and length of telescope is 110cm. Magnifying power of the same telescope when the image is formed at the near point is

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a

23

b

26

c

14

d

18

answer is D.

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Detailed Solution

f0fe=m=10 ; L=f0+fe=110

By solving (1) and (2) we get,

fo=100 cm and fe=10 cm

For near point,

M'=-fo1D+1fe=-100125+110=-14

Minus sign means final image is inverted.

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Magnifying power of an astronomical telescope for normal adjustment is 10 and length of telescope is 110cm. Magnifying power of the same telescope when the image is formed at the near point is