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A fish at a depth of sqrt(7) cm bleow th...

A fish at a depth of `sqrt(7)` cm bleow the surface of water sees the outside world through a circular horizon. What is the radius of the circular horizon? `[ ""_(a)mu_(w) = (4)/(3)]`

A

4 cm

B

3 cm

C

`sqrt7` cm

D

1 cm

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