Posted by DCM on Wednesday, March 7, 2012 at 8:20pm.
Apparently the two colors enter the glass at different incidence angles but have the same angle of refraction (A) inside the glass.
For the red light,
sin 26.5 = 1.520 sinA
Therefore
sin A = 0.2936
A = 17.07 degrees
For the violet light, with the same angle of refraction A
sin I = 1.538 sinA = 0.4516
I = 26.84 degrees
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