Q.
In a terrestrial telescope, the focal length of objective is 90 cm, of inverting lens is 5cm and of eye lens is 6 cm. If the final image is at 30 cm, then the magnification will be
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a
21
b
12
c
18
d
15
answer is C.
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Detailed Solution
m=f0fe1+feD⇒m=9061+630⇒m=18
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