Try this experiment: Shine a flashlight (or a desk lamp) on your hand so that it casts a shadow on a sheet of white paper. Hold your hand about 15–30 cm (6–12 inches) above the paper.
main question:
Why do you think the shadow has fuzzy edges?
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Explanation:
The edge of the shadow is a result of mainly 2 things:
The shape of the light source. If the light source is big, the edge is blurry.
The closer the object is to the light source, the more blurry the edges will be.
There is a lot of people that thinks that the blurriness is mostly caused by the air molecules and diffraction of light waves which is a very miss leading answer. Sure, there is some very small effect of this, but the two reasons mentioned above is the main reasons that does a huge impact on the anatomy of the edges of the shadow.
The latin word for the edge is by the way called “penumbra”.
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