This decomposition depends on the dispersive power of the substance.
The dispersive power upon the spectrum may be much increased by using several prisms instead of one.
The spectrum will have a certain length, depending on the dispersive power of the glass.
The effect in question depends upon the dispersive power of the prism.
Glasses can now be made differing considerably both in refractivity and dispersive power.
The symbol ν represents the inverse of the dispersive power, its value being (nD − 1)/(C − F).
The second of these two expressions is generally given as the definition of dispersive power.
These effects are due to the difference in dispersive power of the powder and the liquid.
Thus the dispersive power of flint glass and balsam are about equal, while that of crown glass is considerably less.