Sunlight strikes a piece of crown glass at an angle of incidence of 31.7o. Calculate the difference in the angle of refraction between a red (660 nm) and a blue (470 nm) ray within the glass. The index of refraction is n=1.520 for red and n=1.531 for blue light. hint: You have to calculate the angle of refraction for both light rays (they have different indices of refraction). You are looking for the difference of these angles.
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