A thin equiconvex lens (mu=3//2) of foca...

A thin equiconvex lens `(mu=3//2)` of focal length 10cm is cut and separated and a material of refractive index 3 is filled between them. What is the focal length of the combination?

`2.5 cm`

`10 cm`

`-2.5 cm`

`-10 cm`

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