You agree that b and c are at the same voltage?
i.e. b = c
Voltage drop is the difference between voltages. i.e. from c to a it is V(c)-V(a).
But since V(c) = V(b) (the voltage at c is the same as the voltage at b), then V(c)-V(a) = V(b)-V(a) by simple substitution.
Voltage...
Thanks for the replies.
I'd already checked wiki and I can derive and apply the Fresnel equations (which is how I know reflected stuff can be polarised!) I think I didn't explain my question properly, but Andy has provided exactly the sort of derivation I'm looking for. Thanks Andy!
I'm looking at a surface at an angle. Light reflected to me is polarised (Fresnel), does this mean light emitted to me from the surface is also polarised?
I've been told that ocean emission is polarised (when looking at an angle) because of Kirchoff's law of radiative balance (emissivity =...