Edser and Butler's bands

Edser and Butler's bands

[¦ed·sər ən ′bət·lərz ‚banz]
(optics)
Dark bands at intervals of equal frequency in a spectrum of light which has passed through a thin plate of transparent material with parallel sides.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.