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You can see all the stripes when you do this. The demonstration is about light's property as a wave.
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This is a picture of water so you can see the waves spreading out from the hole. Light does the same thing. And when you have two holes next to each other, the peaks and valleys of the wave will interact with each other.
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Now imagine a vertical line where those waves are interacting to the right of the holes. If this were light and the line you imagined was a wall, the parts of the waves that are high are bright and the valleys are dark.
