An astronomical telescope, consists of two thin lenses set 36cm a part and has a magnifying power 8. Calculate the focal length of the lenses.
32cm
18cm
36cm
25cm
A
32cm
B
36cm
C
18cm
D
25cm
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Solution
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Here, fo+fe=36cm M=−8 (magnifying power is negative) Now, M=fofe ∴−8=−8=−fofe ⇒fo=8fe
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