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The index of refraction for a certain type of glass is 1.639 for blue light and 1.607
for the red light. A beam of white light (one that contains all colors) enters a plate
of glass from the air, nair=1, at an incidence angle of 39.55°. What is the absolute
value of 8, the angle in the glass between blue and red parts of the refracted
beams?

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