Photons that come near small particles will diffract around the edge, causing some to be scattered at an angle to their initial direction.
Smaller particles scatter through a larger angle, however the intensity of the scattered beam is less than for large particles.
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/