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Two lens in contact form an achromatic combination. Their focal lengths are in the ratio of 2 : 3.

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Two lens in contact form an achromatic combination. Their focal lengths are in the ratio of 2 : 3. Their dispersive powers will be in the ratio of : 

(a) 3 : 1 

(b) 1 : 3 

(c) 2 : 3 

(d) 3 : 2

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1 Answer

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Best answer

Correct option (c) 2 : 3

Explanation:

The condition for the achromatism is given by

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