OSA's Digital Library

Applied Optics

Applied Optics


  • Vol. 11, Iss. 9 — Sep. 1, 1972
  • pp: 1916–1918

Refractive Index Measurement by Interference Microscopy: Corrections for Dispersion

William D. Ross  »View Author Affiliations

Applied Optics, Vol. 11, Issue 9, pp. 1916-1918 (1972)

View Full Text Article

Enhanced HTML    Acrobat PDF (531 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



The refractive index of a particle can be determined with microscope equipment for measuring interference in transmitted light. If the path difference is several wavelengths, white illumination will be used. If the particle has strong dispersion, measurements made with white light give an apparent refractive index much higher than the true one. The apparent index is related to the group velocity of light waves in the substance in the same way that the true index is related to phase velocity. Flaky crystals of hematite showed apparent index 4.52, in agreement with theory, compared with the true ordinary index around 3.09.

© 1972 Optical Society of America

Original Manuscript: January 7, 1972
Published: September 1, 1972

William D. Ross, "Refractive Index Measurement by Interference Microscopy: Corrections for Dispersion," Appl. Opt. 11, 1916-1918 (1972)

Sort:  Author  |  Journal  |  Reset  


  1. J. A. Stratton, Electromagnetic Theory (McGraw-Hill, New York, 1941), pp. 330–333.
  2. E. S. Larsen, H. Berman, “The Microscopic Determination of the Non-Opaque Minerals,” U.S. Department of the Interior Geological Survey Bulletin 848 (Washington, D.C., 1934).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited