Image: Newton's rings 02

Description: Schematic cross-section of the apparatus to observe Newton's rings. A round glass flat and plano-convex lens are pressed together by a metal frame. In an actual apparatus, the curvature of the convex surface is much less than illustrated; an inexpensive commercial apparatus typically has an aperture of 25 mm, and the separation of the two glass pieces near the edge is about 0.01 mm.
Title: Newton's rings 02
Credit: http://www.fas.harvard.edu/~scidemos/LightOptics/NewtonsRings/NewtonsRings002.gif as displayed by Newton's Rings at http://www.fas.harvard.edu/~scidemos/LightOptics/NewtonsRings/NewtonsRings.html at Harvard University's Harvard Natural Sciences Lectures site at http://www.fas.harvard.edu/~scidemos/, copied to en:Image:Newton's rings 02.gif, and traced and uploaded to Commons by Stannered.
Author: Original by Harvard University at its Harvard Natural Sciences Lectures site at http://www.fas.harvard.edu/~scidemos/. Uploaded to English Wikipedia by en:Epitronic (Talk · contribs). Traced and uploaded to Commons by Stannered.
Permission: Copyrighted free use (+attribution) originally from the Harvard Natural Sciences Lectures site: http://www.fas.harvard.edu/~scidemos/
License: Attribution