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(D) double-concave lens acts as a converging lens if its effective refractive index $n_{lens}$ is greater than the refractive index of the surrounding

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$L_2$ and immersed in $L_1$

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(D) double-concave lens acts as a converging lens if its effective refractive index $n_{lens}$ is greater than the refractive index of the surrounding medium $n_{medium}$.For a lens filled with a medium of refractive index $n_{in}$ and placed in a medium of refractive index $n_{out}$, the lens behaves as a converging lens if $n_{in} > n_{out}$.Given that the lens is double-concave, it normally diverges light. To make it converge light, the refractive index of the material inside the lens must be greater than the refractive index of the surrounding medium.Therefore, if the lens is filled with $L_2$ (refractive index $n_2$) and immersed in $L_1$ (refractive index $n_1$), it will act as a converging lens if $n_2 > n_1$.

$A$ thin double-concave lens is made of a very thin transparent material. It can be filled with air or two liquids $L_1$ and $L_2$ having refractive indices $n_1$ and $n_2$ respectively. The lens will converge a parallel beam of light if it is filled with ........

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