Recent content by eliben

Later, at page 105 (and figure 68) Feynman says that for class, the turn is 90 degrees, and not 180 as in Figure 41. What accounts for the difference ?

Thanks a lot !

I don't understand, sorry. The path the light makes inside the glass (3-5-7) doesn't cancel out, because there are two shrinks by 0.2 caused by it (at points 4 and 6). What does cancel out is that the path inside the glass on the way to A (3-5) sometimes cancels out the direct reflection off...

Hello, This is my first post to physicsforums. I hope I've picked the right forum for this question, please correct me if not :blushing: To answer my question you'll have to have the book "QED, the strange theory of light and matter" in front of your eyes. I'm now reading Feynman's QED...