Huygens' Principle is the idea that a plane wave traveling through a slit will expand outwards after passing through a slit.


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)


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?


1 Answer 1


No, the rays are not a diffraction effect. They are either due to scattering st the lens surface, or due to scatter from light rays passing through a slight fog between the camera and the trees. Probably they are due to lens scatter. If rotating the camera and shooting the same scene results in the rays rotating to a different angle, it's lens scatter.


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