Two lenses have focal lengths f1 and f2 and their dispersive powers are ω1 and ω2 respectively. They will together form an achromatic combination if

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ω1f1=ω2f2

ω1f2+ω2f1=0

ω1+f1=ω2+f2

ω1−f1=ω2−f2

answer is B.

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Detailed Solution

For achromatic combination, ω1f1+ω2f2=0⇒ω1f2+ω2f1=0

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