Trons and tons
Why are many conductors usually (Barring a few exceptions) opaque?
A) Electric conductors are bad conductors of light.
B) Electric conductors contain mobile electrons, these electrons repel the electric part of the EM wave.
C) Electric conductors produce their own metallic light which blocks background light.
D) A metal cant be a good conductor for light and electricity at the same time.
E) The mobile electrons effectively "shorts out" the electrostatic part of EM waves (light)and this reflects the energy from the surface.