Two lenses in contact form an achromatic lens. Their focal
lengths are in the ratio 2 : 3. Their dispersive powers must
be in the ratio of
(a) 1 : 3 (b) 2 : 3 (c) 3 : 2 (d) 3 : 1
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Answer:
2:3(b)
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Answer:
2:3 FRIEND
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