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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 49, Iss. 4 — Apr. 1, 1959
  • pp: 398–399

Selection of Glasses for Three-Color Achromats

ROBERT E. STEPHENS  »View Author Affiliations


JOSA, Vol. 49, Issue 4, pp. 398-399 (1959)
http://dx.doi.org/10.1364/JOSA.49.000398


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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.

Citation
ROBERT E. STEPHENS, "Selection of Glasses for Three-Color Achromats," J. Opt. Soc. Am. 49, 398-399 (1959)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-49-4-398

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