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A ray of red light, for which n=1.54, and a ray of violet light, for which n=1.59, travel through a piece of glass. They meet right at the boundary between the glass and the air, and emerge into the air as one ray with an angle of refraction of 22.5.

What is the angle between the two rays in the glass?

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  1. Use Snell's law to find each incident angle, then take the difference.

    find each angle of incidence withthat.

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