A hollow double concave lens is made of ...

A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L_1 or L_2 having refractive indices mu_1 and mu_2 respectively `(mu_2gtmu_1gt1)`. The lens will deverge a parallel beam of light if it is filled with

air and placed in air

air and immersed in `L_1`

`L_1` and immersed in `L_2`

`L_2` and immersed in `L_1`

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The correct Answer is:

`n_2gtn_1`

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