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In an astronomical telescope in normal a...

In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on inside part of objective lens. The eys-piece forms real image of this line. The length of this image is I. The magnification of the telescope

A

`frac(L)(I)`

B

`frac(L)(I) + 1`

C

`frac(L)(I) - 1`

D

`frac(L + I)(L - I)`

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