A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is ${4 \over 3}$ and the fish is $12$ $cm$ below the surface, the radius of this circle in $cm$ is
${{36} \over {\sqrt 7 }}$
${36\sqrt 7 }$
${4\sqrt 5 }$
${36\sqrt 5 }$
Solution
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