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# In physics and optics, diffraction is the phenomenon in which waves, such as light or sound waves, spread out as they pass through a narrow opening, or aperture. The spreading occurs only for waves whose wavelength is comparable to or larger than the dimensions of the aperture.

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##### Andy C.

University of Michigan - Ann Arbor

LB
##### Aspen F.

University of Sheffield

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### Video Transcript

welcome to our first example video. Looking at single aperture diffraction in this video, we're going to be looking for the width of the aperture. A given that we have incoming wave length equal to 630 nanometers, and that on a screen which is 1.2 m behind our filter, we find that we have the first dark fringe appearing at 1.3 centimeters. Remember you. We are looking for dark fringes here, and our equation looks a lot like what we had before, where it's going to be. M times Lambda L over a where a is the width of the opening solving for a we have em which is one because it's the first dark fringe multiplied by Lambda, which is 630 times 10 to the negative 9 m multiplied by L, which is 1.2 m, all divided by y, which is 1.3 times 10 to the negative 2 m. And we have our result for how large a is

RC
University of North Carolina at Chapel Hill
##### Andy C.

University of Michigan - Ann Arbor

LB
##### Aspen F.

University of Sheffield