5. Reciprocal linear dispersion
A dispersive system is characterized by reciprocal linear dispersion and practical resolution. The reciprocal linear dispersion d λ /dx, is the ability of a dispersive system to spread the spectrum in the focal field. It is expressed in nm · mm
–1
. The lower the value, the better the dispersion. The term "reciprocal" comes from the fact that we originally spoke of linear dispersion d x / d λ. Derivation of the lattice equation on the angle β leads to :
The reciprocal linear dispersion is related to the angular dispersion d λ /d β by the focal length f :
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Reciprocal linear dispersion
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