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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