What is Optical path difference

What is Optical path difference

What is optical path difference

It is n1x1 – n2x2, where n1 and n2 are refractive indices of media and x1 and x2 are the respective geometrical paths.

Or

It is the difference in the length of paths taken by two light waves from the source to the point of meeting.

Or

It is the difference in length of paths taken by two wave trains from coherent sources in the same time interval.

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