Where does fringe collide?

In wave optics, a fringe is one of the alternating bright and dark bands produced when coherent light waves overlap and interfere, bright where they arrive in phase and reinforce, dark where they cancel. Young's 1804 Bakerian Lecture, Experiments and calculations relative to physical optics, reported the fringes of his two-slit experiment as direct evidence for the wave nature of light and used their spacing to estimate wavelength. The referent is a spatial pattern of light intensity carrying phase information, measured by fringe spacing and visibility, and it is unrelated to a workplace benefit beyond the shared meaning of something at the edge or margin.[1]

Unit

The spacing and contrast of the interference bands

Recovery means

Not applicable

Measured by

Quantified by fringe spacing, which sets wavelength or path difference, and by fringe visibility (contrast)

In labour economics, a fringe benefit is a form of employee compensation beyond direct wages, such as pensions, health insurance, or paid leave, so called because it once sat at the margin of the pay packet. Lurie's 1966 The growth of fringe benefits and the meaning of wage setting by wage comparisons analysed why such benefits expanded and how they interact with wage-setting. The referent is a component of the labour contract, valued in money terms and traded off against wages, and it has nothing to do with bands of light beyond the shared image of an edge or border.[2]

Unit

The money value of non-wage compensation in a pay package

Recovery means

Not applicable

Measured by

Valued as the employer cost or employee worth of non-wage items, often as a share of total compensation