Intensity of Electromagnetic Wave

1. The problem statement, all variables and given/known data

Show that intensity of radiation(EM wave) falls off with depth z
as
I(z)= Ie^(-2niwz/c)

where I = initial intensity
and ni=complex paert of refractive index

2. Relevant equations
I have tried the solving the solution using poynting vector.


I have been pondering over the question over the last two days without any success. I think i am making it more complicated than it needs. to be. I would appreciate it if you point me in the right direction .
 

turin

Homework Helper
2,323
3
Determine the electric field. You are probably supposed to assume that an EM wave is normally incident on the surface.
 

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top