A beam of light traveling in air, strikes a plate oftransparent material at an a

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A beam of light traveling in air, strikes a plate oftransparent material at an angle of incidence of 56. It is observedthat the reflected and refracted beams form an angle of 90 wha isthe index of refraction of this material? I know what the laws of refraction and relfected is but i dontunderstand why their would be two inex of refractions in theequation? could someone please help A beam of light traveling in air, strikes a plate oftransparent material at an angle of incidence of 56. It is observedthat the reflected and refracted beams form an angle of 90 wha isthe index of refraction of this material? I know what the laws of refraction and relfected is but i dontunderstand why their would be two inex of refractions in theequation? could someone please help

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sorry, somehow i submitted an answer when all i wanted to do was go back.

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