why does 'backward propagation of light'doesn't take place?

Subject: why does 'backward propagation of light'doesn't take place?

Date: Fri Aug 4 02:00:36 2000
Posted by girish kulkarni
Grade level: 10-12 School: somalwar high school
City: nagpur State/Province: maharashtra Country: india
Area of science: Physics
ID: 965368836.Ph

Message:


i want to ask the fact that light originating from the source goes only in 
one direction i.e.in the forward ...why not in the backward???

Re: why does 'backward propagation of light'doesn't take place?

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