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A diver looking up through the water see...

A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is `(4)/(3)`, and the diver's eyes are 15 cm below the surface of 3 water. Then the radius of the circle is:

A

`15 xx 3 xx sqrt5 cm`

B

`15 xx 3 xx sqrt7 cm`

C

`frac(15 xx sqrt7)(3)cm`

D

`frac(15 xx 3)(sqrt7)cm`

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