Optics > Interference > Thin Films DCS# 6D30.10

PROJECTED NEWTON'S RINGS



APPARATUS
 
Newton's rings apparatus 202-21-D5
slide projector and projection lens or document camera


DESCRIPTION
The apparatus consists of a long-focal-length convex lens pressed against a flat glass plate.  The reflections off the two inner air-glass interfaces produce a circular interference pattern. 

NOTES
There are several ways to show the pattern: