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OpenStudy (anonymous):
Suppose a beam of red light enters a plate of crown glass at an angle of incidence of 30 degrees. What is its angel of refraction? **will draw inside!** 19 degrees, 25 degrees, 30 degrees, or 78 degrees ?
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OpenStudy (michele_laino):
we have to apply the law of Snell
OpenStudy (anonymous):
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