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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Dec 2007 19:56:41 IST
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what is optical path length?
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12 Dec 2007 20:28:26 IST
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L  (x) dx=OPL
where the integration is along the path
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12 Dec 2007 20:32:54 IST
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Optical path is the product of the actual path and the refractive index of the medium.
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Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur
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It is the distance which light would travel in vacuum in same time span in which travels in the medium.
So, OP = t x Speed of light(c) = tc
Now, c/c'=k (refractive index of medium)
so, OP =( tc') k = Path travelled in medium x Refractive index of medium
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