Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and `omega_(2)` respectively. They will together form an achromatic combination ifA. `omega_(1)f_(1)=omega_(2)f_(2)`B. `omega_(1)f_(2)+omega_(2)f_(1)=0`C. `omega_(1)+f_(1)=omega_(2)+f_(2)`D. `omega_(1)-f_(1)=omega_(2)-f_(2)`

Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive

1.	Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and `omega_(2)` respectively. They will together form an achromatic combination ifA. `omega_(1)f_(1)=omega_(2)f_(2)`B. `omega_(1)f_(2)+omega_(2)f_(1)=0`C. `omega_(1)+f_(1)=omega_(2)+f_(2)`D. `omega_(1)-f_(1)=omega_(2)-f_(2)`
Answer» Correct Answer - b

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