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Equation
       
    Name Dispersivity, dispersive power
 
    Equation d = n 2 - n 1 n ¯ - 1
 
    Definition of terms

d = dispersivity, n1 and n2 = refractive indices at two specified wavelengths, n ¯ = refractive index at the mean of the two wavelengths, or at the wavelength of the sodium D line
 
    Comments

  The dispersivity is a measure of the power of a medium to separate different colours of light. n1 and n2 are the refractive indices of the medium at two specified wavelengths of light. n ¯  is the refractive index of the medium at the mean of these two wavelengths, or at the wavelength of the sodium D line.

 
    References
McGraw-Hill Dictionary of Physics and Mathematcis, McGraw-Hill, 1978
       


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