1.

A fish looking up through the wave sees the outside world contained in a circular horizon. If the refractive index of water is (4)/(3) and the fish is 12 cm below the surface, the radius of this circle in cm is

Answer»

`36sqrt5`
`4sqrt5`
`36sqrt7`
`(36)/(sqry7)`

Solution :As shown in Fig. `SIN i_(c)=(1)/(n)=(1)/(4//3)=(3)/(4) and H=12 cm`
`therefore""sini_(c)=(3)/(4)=(h)/(sqrt(R^(2)+h^(2)))=(12)/(sqrt(r^(2)+144)) rArr r=(36)/(sqrt7)cm`


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