No Deviation Allowed

It is desired to make an achromatic combination of two lenses ( L 1 L_1 & L 2 L_2 ) made of materials having dispersive powers ω 1 \omega_1 and ω 2 \omega_2 respectively where ω 1 > ω 2 \omega_1 > \omega_2 . If the combination of lenses is converging then

Power of L 1 L_1 is greater than power of L 2 L_2 L 1 L_1 is converging and L 2 L_2 is diverging Both of them are diverging L 2 L_2 is converging and L 1 L_1 is diverging

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