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Q.

The magnifying power of a telescope is 9.  When it is adjusted for parallel rays the distance between the objective and eyepiece is 20cm.  The focal length of lenses are

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a

15 cm, 5 cm

b

11 cm, 9 cm

c

18 cm, 2 cm

d

10 cm, 10 cm 

answer is A.

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Detailed Solution

M=9=f0fe⇒f0=9fe

f0+fe=20

10fe=20⇒fe=2f0=18

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The magnifying power of a telescope is 9.  When it is adjusted for parallel rays the distance between the objective and eyepiece is 20cm.  The focal length of lenses are