- #1
penguin007
- 77
- 0
Hi,
I've just read Feynman's book:'QED:The strange theory of light and matter' and, in order to measure the probability that a photon will reflect or transmit through a partially reflective piece of glass, Feynman introduces an 'imaginary stopwatch'. Can you explain me:
-what do the hands of this stopwatch represent;
-why does Feynman oppose the sense of the first hand in the case of a reflection by two surfaces;
-how does he know the length of the hands when he measures the probability?
Thanks.
I've just read Feynman's book:'QED:The strange theory of light and matter' and, in order to measure the probability that a photon will reflect or transmit through a partially reflective piece of glass, Feynman introduces an 'imaginary stopwatch'. Can you explain me:
-what do the hands of this stopwatch represent;
-why does Feynman oppose the sense of the first hand in the case of a reflection by two surfaces;
-how does he know the length of the hands when he measures the probability?
Thanks.