Re-use of this resource is governed by a Creative Commons
Attribution-
NonCommercial-ShareAlike 4.0 International
https://creativecommons.org/licenses/by-nc-sa/4.0/
The greyscale image on the left shows a nematic liquid
crystal between crossed polars at 20x magnification. Use the slider
to rotate the stage through 180° to observe the variation in brightness
of the different regions.