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Question

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
207126_03be2bd6e7824f308ef51dfc017061da.jpg

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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