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Main Question or Discussion Point
SOme one help me with the OPD.
How is here the OPD=n2(AB + BC) n1(AD)?
I am not confused with the introduction of 'n'..Rather the path length is confusing me..Why is there a negative sign?
How is here the OPD=n2(AB + BC) n1(AD)?
I am not confused with the introduction of 'n'..Rather the path length is confusing me..Why is there a negative sign?
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