The length of the optical path of two me...

The length of the optical path of two media in contact of length `d_(1)` and `d_(2)` of refractive indices `mu_(1)` and `mu_(2)` respectively, is

`mu_(1)d_(1)+mu_(2)d_(2)`

`mu_(1)d_(2)+mu_(2)d_(1)`

`(d_(1)d_(2))/(mu_(1)mu_(2))`

`(d_(1)+d_(2))/(mu_(1)mu_(2))`

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