A plane mirror is placed horizontally in...

A plane mirror is placed horizontally inside water (`mu`=4/3). A ray falls normally on it. Then mirror is rotated through an angle `theta`. The minimum value of `theta` for which ray does not come out of the water surface is

`(pi)/(4)`

`sin^(-1)((3)/(4))`

`(1)/(2)sin^(-1) ((3)/(4))`

`2 sin^(-1) ((3)/(4))`

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