The distance of the path that in a vacuum would contain the same number of wavelengths as the actual path taken by a ray of light traveling through a medium.
- For the interferometry to work, the optical paths have to be stable to fractions of a wavelength.
- Two tandem cells with a total optical path length of 1 cm were used for measuring the difference spectra.
- The compact nature of the photoreceptor mass requires the pigment screen to be extremely dense, as very short optical paths separate receptors from each other.
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