The refractive index of a certain glass is 1.68. For what incident angle is light reflected from the surface of this glass completely polarized if

The refractive index of a certain glass is 1.68.

For what incident angle is light reflected from the surface of this glass completely polarized if the glass is immersed in air?

For what incident angle is light reflected from the surface of this glass completely polarized if the glass is immersed in water?

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