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Q.

Four lenses of focal length +15cm, +20cm and +150cm and + 250cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eye-piece should be

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a

+ 15cm

b

+ 20cm

c

+ 150cm

d

+ 250cm

answer is A.

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Detailed Solution

For largest magnification focal length of eye lens should be least.

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