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If P1 and P2 be the powers of two lens a...

If `P_1` and `P_2` be the powers of two lens and `omega_1` and `omega_2` respectively be their dispersive powers, then which of the following is essential for their combination to be achromatic ? Given that one lens is convex and the other is concave.

A

`omega_1=omega_2`

B

`omega_1 P_1 = omega_2 P_2`

C

`P_1=P_2`

D

None of the above.

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