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Why do you see shadows when there are multiple light sources?

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Any rays blocked by the pencil don't reach the other side, so that bulb casts a shadow there. The size of the shadow depends on the distances you specified and the size of the pencil. When you repeat this for all four bulbs, you can see how the shadows overlap and where they're separated. read more

If one see 2 sources, it has more energy than the once that see 1 source, so you see a brightness difference called “shadow”. Similarly, if another point see half the source, it is half as bright. read more

« Reply #2 on: 12/10/2008 06: 26: 55 » [diagram=371_0] ^here's the ray diagram to go with my explanation. read more

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Q & A: Double Shadows
van.physics.illinois.edu

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