A hollow doublew concave lens is made of...

A hollow doublew concave lens is made of very thin transparent material.It can be filled with air ofr either of two liquids `L_1` and `L_2`having refractive indices `mu_1` and `mu_2` respectively `(mu_2>mu_1>1)`.The lens will diverge a parallel beam of light,if it is filled with

air and placed in air

air and immersd in `L_1`

`L_1` and immersed in `L_2`

`L_2` and immersed in `L_1`.

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