Refraction!

Level 2

A fish looking up through the water sees that the outside world is contained in a circular horizon. If the refractive index of water is 4 5 \frac{4}{5} and the fish is 12 centimeter below the surface of water, the radius of the circle (in centimetre) is

36 5 36\sqrt{5} 36 7 \frac{36}{\sqrt{7}} 36 5 \frac{36}{\sqrt{5}} 36 7 36\sqrt{7}

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