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A beam of light strikes a sheet of glass at an angle of 57.0deg. with the...

A beam of light strikes a sheet of glass at an angle of 57.0deg. with the normal in air. You observe that red light makes an angle of 38.1 degrees with the normal in the glass, while violet light makes a 36.7-degree angle.

How can I find the critical angle that will make red and violet total internal reflection?

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