Light propagation in air without hitting molecules ?

  • Thread starter toan
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hi,

Could any one help me the following question?

I am reading light transmission through a slab of air (at the ambient atmosphere). My question is: How much light is transmitted without hitting any air molecules?

In details: An incident light beam propagates through a slab, of some thickness, of air. The output light at the end of the slab can be divided into two parts. The first part is the portion of the incident beam that crosses the air slab without hitting any air molecules. The second part is wavelets that is re-radiated by air molecules (due to scattering and absorption/emission). I am concerned with the first part.


Please help me any specific quantity, links to relevant documents, or hints to calculation,... that you know. Thank very much.
 

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