A combination is made of two lenses of focal lengths f and f′ in contact; the dispersive powers of the materials of the lenses are ω and ω′. The combination is achromatic when
A
ω=ω0,ω′=2ω0,f′=2f
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B
ω=ω0,ω′=2ω0,f′=f/2
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C
ω=ω0,ω′=2ω0,f′=−f/2
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D
ω=ω0,ω′=2ω0,f′=−2f
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Solution
The correct option is Dω=ω0,ω′=2ω0,f′=−2f For an achromatic combination of lenses,