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A fish, looking up through the water see...

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 surace of water, the radius of the circle in centimere is

A

`(12 xx 3)/sqrt7`

B

`12 xx 3 xx sqrt7`

C

`(12 xx 3)/sqrt5`

D

`12 xx 3 xx sqrt5`.

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