When a biconvex lens of glass having ref...

When a biconvex lens of glass having refractive index `1.47` is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.

`mu_g=mu_l`

`mu_llt1`

`mu_lgtmu_g`

`mu_(l) lt mu_(g)`

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