HW

E block - When last we met, we were chatting about total internal reflection.  Use Snell's law to derive an expression for the critical angle of a material.  Assume that light comes from inside the material (say, water, though you can just call it n1) and goes to air (n2 = 1).  This will be a simple expression.

E and A:

Read about fiber optics and see how is is related to total internal reflection.

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Problems:

1.  What is the critical angle of a material with index of refraction 1.6?

2.  Can you make a general expression for critical angle, one that represents light traveling between any two mediums?  That is, assume that the new medium is NOT air, but rather some stuff with index n2.