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Q.

The focal length of objective and eye lens of a astronomical telescope are respectively 2 m and 5 cm. Final image is formed at (i) least distance of distinct vision (ii) infinity. The magnifying power in both cases will be

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a

– 48, – 40

b

– 40, – 48

c

– 40, 48

d

– 48, 40

answer is A.

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Detailed Solution

When the final image is at the least distance of distinct vision, thenm=−fofe1+feD=20051+525=200×65×5=−48When the final image is at infinity, thenm=−fofe=2005=−40
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The focal length of objective and eye lens of a astronomical telescope are respectively 2 m and 5 cm. Final image is formed at (i) least distance of distinct vision (ii) infinity. The magnifying power in both cases will be