A man looks down on a fish of length 20 ...

A man looks down on a fish of length 20 cm. His eye is 2m above the surface of the water `(mu = 4//3)` and the fish is 2m below the surface as shown in the figure the ratio of angular width `Delta theta` of the fish as seen by the man in presence of water to the `Delta theta` in the absence of water is `(Delta theta` is small)

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