<S>=c[itex] \epsilon [/itex]E2/2
[itex] \Delta P = A \Delta t <S>/c [/itex]
The Attempt at a Solution
My question is if we need the "box height"? This is my work which I'm assuming is wrong. :C
If there's another problem like this on here please put a link. I didn't see any, but my search terms may not have been ideal "Pressure of light in a box".