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Calculate the angle of refraction and re...

Calculate the angle of refraction and refractive index of water if reflected light is plane polarised when incident at an angle of `55^@`.

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`i_P = 55^@`
`i_P + r = 90^@`
`55^@ + r = 90^@`
`r = 35^@`
`mu = tan i_P`
`= tan 55^@ = 1.42`.
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