An observers line of sight is at P, when...

An observers line of sight is at P, when container of diameter 30 cmand height 45 cm is empty.If this container is filled with liquid upto 30 cm height he is able to see the edge of container.Find refractive index of liquid.

`sqrt(5/2)`

`5/sqrt2`

`sqrt5/2`

`5/2`

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