One of the mysteries of the English language finally explained.
The distance which in a vacuum would contain the same number of wavelengths as the actual path taken by a ray of light.
- ‘Two tandem cells with a total optical path length of 1 cm were used for measuring the difference spectra.’
- ‘The optical path difference is directly proportional to the cosine of the angle of refraction through the coating.’
- ‘The difference in optical path length is proportional to the difference in indices of refraction.’
- ‘For the interferometry to work, the optical paths have to be stable to fractions of a wavelength.’
- ‘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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