Penetration Depth, Skin Depth
A very similar approach uses the penetration depth:
where is the penetration depth.
The skin depth is defined so that the wave satisfies:
where is the skin depth.
Physically, the penetration depth is the distance which the wave can travel before its intensity reduces by a factor of . The skin depth is the distance which the wave can travel before its amplitude reduces by that same factor.
The absorption coefficient is related to the penetration depth and skin depth by
Read more about this topic: Mathematical Descriptions Of Opacity
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