“…Again, for a 1-cm path length and wavelengths in the ultraviolet and visible, substitution shows that the fringe spacing ranges roughly from 0.002 nm to 0.02 nm, too close to be resolved by a conventional spectrophotometer. Interference effects may, therefore, be ignored in a discussion dealing only with ultraviolet-visible spectrophotometry; the topic is much more important in the infrared due to the longer wavelengths and much shorter pathlengths employed (2,3).…”