Quantum Electro Dynamics
Posted on 2011-05-05
I'm reading a popular book on QED and it explains that while light appears to travel in a direct line from the bulb to the mirror and then to the observer, in reality the light is bouncing off the mirror every which way, and it is only the frequency cancellation that makes these other less-direct paths not directly observable.
What about light going from the bulb to the observer without bouncing off of anything? Is that also traveling in many different ways with the less direct paths cancelling out? Or in that case, is the light that you see just following the direct path?