Today students handed in Assignment 3.1 on refraction diagrams. We then learned how to deal with situation when Snell's Law returns an error. These are special situations called total internal reflection when light doesn't refract and leave the material, but stays inside and refracts around. This happens when light is moving from a material with a high index of refraction to a material with a lower index of refraction and it tries to leave at an angle greater than a special angle called a critical angle. The critical angle is a special incident angle where the refracted angle is 90 degrees. This was all covered on slides 53-59 in the powerpoint. Part C of the Refraction Practice Problems was assigned today and we will go over this tomorrow.
Tomorrow we will start looking at an application of this stuff. We are going to look at start looking at geometric optics.
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