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according to Huygens, (i think) light is a ciruclar wave, and at everypoint on the wave there are wavelets. because there are so many ways for the wavelets to form, light takes every possible path from point a to point b. that parts sort of makes sense. then, all the really weird paths get cancelled, out and you are left with essentially a cone of light.

the above (if i got it right) sort of makes sense. but what doesn't is that this is supposed to explain why when you make a pinhole that's too small you get blurryness. shouldn't you just get the image to be not as bright? i don't quite see where the blurry part comes in.