Huygens' Principle is the idea that a plane wave traveling through a slit will expand outwards after passing through a slit.
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/huygen.html
I was looking at a photo recently of a forest where rays of light are coming through the leaves (Here is an example of a similar photo)
https://depositphotos.com/193020512/stock-photo-fresh-green-foliage-with-the.html
Are these rays of light around the opening in the tree line actually an example of the wavelets described by Huygens' Principle? Or is something else at play?