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The 23 pages that link to Optical path length, each with the reason it gives.

• Refractive indexRelated: Refractive index converts physical distance into phase-accumulating optical distance.

• Beer–Lambert lawRelated: The law predicts greater absorbance when light travels farther through the same solution.

• InterferometryRelated: Interferometers respond to differences in optical path length between waves.

• Michelson interferometerRelated: The instrument compares optical path lengths, not distance alone.

• Michelson–Morley experimentRelated: A path-length difference between the arms would shift the interference pattern.

• Geometrical opticsRelated: It connects ray paths to travel time and Fermat's principle.

• Principle of least actionBroader topic: Fermat’s principle varies this quantity, while mechanics varies action.

• Fermat's principleRelated: Minimizing or stationarizing optical path length is equivalent to stationarizing travel time.

• Fabry–Pérot interferometerRelated: The cavity’s optical path sets the round-trip phase condition for resonance.

• TransmittanceRelated: Path length affects how much radiation a sample attenuates.

• AbsorbanceRelated: Longer paths generally produce greater absorbance at the same concentration.

• SpectrophotometerRelated: It affects absorbance and must be known when estimating concentration.

• Thin-film interferenceRelated: It sets the phase difference accumulated by light traveling within the film.

• Wave opticsRelated: It translates travel through refractive materials into phase accumulation.

• Fresnel diffractionRelated: Path-length differences determine phase differences among contributions to the pattern.

• Phase-contrast microscopyRelated: Differences in optical path length through the specimen generate the phase differences being imaged.

• Mach–Zehnder interferometerRelated: An arm's optical path length sets how much phase its light accumulates.

• Albert A. MichelsonRelated: His measurements depended on comparing optical paths, not merely physical distances.

• Newton's ringsRelated: It determines the phase difference between the two reflected waves.

• Schmidt–Cassegrain telescopeRelated: The folded path provides a long effective focal length despite the telescope’s short tube.

• Anti-reflective coatingRelated: It determines the phase accumulated by light traveling through the coating.

• PentaprismRelated: Differences in optical path through the prism affect phase and image-forming behavior, though not its nominal turn.

• Frits ZernikeRelated: Specimen-induced changes in optical path length create the phase shifts Zernike made visible.