A fish looking up through the water sees...

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is `(4)/(3)` and the fish is 12 cm below the surface, the radius of this circle is cm is

`36 sqrt(7)`

`(36)/(sqrt(7))`

`36 sqrt(5)`

` 36 sqrt(4)`

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