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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

A

`36sqrt5`

B

`4sqrt5`

C

`36sqrt7`

D

`36//sqrt7`

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