Abstract
If two thin lens elements of two different glasses are combined into a thin two-element system, then the chromatic properties of the system may be described by the effective values of V [V=(N−1)/(NF−NC)], and P [P=(ΔN/NF−NC)]. The effective value, , is a linear function of . On a graph of P versus V, the straight line drawn through the points for two glasses is the locus of all possible effective values of V and P for combinations of these two glasses. By means of such a graph the effective value for a combination of two glasses may be matched to P of a third glass whose V differs from by a useful amount. An achromatic lens system of the three glasses may then be computed, which will have a common focal length for three wavelengths.
© 1959 Optical Society of America
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