![](http://www.alamy.com/thumbs/6/7C0600E2-47B0-41A7-B3C0-7E805C74413E/A20233.jpg)
colours in plastic protractor in polarised light
Size: 5568px × 3916px
Photo credit: © sciencephotos / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: engineering, fringe, fringes, interference, light, pattern, photoelastic, physics, polarised, polarized, protractor, science, stress