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
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