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Sunlight strikes a piece of crown glass at an angle of incidence of 35.8 degrees. Calculate the difference in the angle of refraction between a red (660. nm) and a green (550. nm) ray within the glass. The indices of refraction for the red and the green are n = 1.520 and n = 1.526, respectively.

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    Use Snell's law to compute the angle of refraction for each color. Call the angles A1 and A2. Then compute the difference, A1 - A2. .

    sin35.8 = 1.520*sinA1
    sinA1 = 0.38484
    A1 = 22.63 degrees

    sin35.8 = 1.526*sinA2.
    A2 = ___
    A1 - A2 = ___

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