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Q.

If the tube length of astronomical telescope is 105cm and magnifying power is 20 for normal setting, calculate the focal length of the objective lens

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a

20 cm

b

100 cm

c

25 cm

d

10 cm

answer is A.

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Detailed Solution

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L=f0+fe=105 cm and M=f0fe=20

⇒f0=100 cm and fe=5 cm

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