Two thin lenses, one convex of focal length 30 cm and the other concave of focal length 10cm are put into contact. If this combination is equivalent to an achromatic lens then the ratio of dispersive powers ( ω 1 / ω 2 ) of above two lenses is -
Text Solution
Verified by ExpertsThe correct answer is:
C
= 0 for achromatic lens .
= 
= 3
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