Amplitude and energy relation in optics

[amir11]

Hi Guys

I have a very simple and basic question. Assume interface of two dielectric mediums. If the t is transmition cofficient for electricfield from medium 1 to medium 2 with refractive indexs n1 and n2, what is the transmitivity of power from medium 1 to medium 2?

I know it is n2/n1*t². But wouldn't you expect it to be (n1/n2)²*t² because the elecromagnetic energy is defined as epsilone*E² which is the same as n²E²?

 

[gomunkul51]

From what I remember the transmition coefficient is defined as the ration of the intensity that is being transmitted to the total intensity and intensity is proportional to the electric field squared. Intensity is proportional to em energy. Does it make sense?

Cheers.Roman.