It is desired to make an achromatic combination of two lenses ($L_1$ and $L_2$) made of materials having dispersive powers $\omega_1$ and $\omega_2$ $(< \omega_1)$. If the combination of lenses is converging,then:
- A$L_1$ is converging
- B$L_2$ is converging
- CPower of $L_1$ is greater than the power of $L_2$
- DNone of these
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