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Diffraction on a Slit

Diffraction on a Slit

C009/4581

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Credit

GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY

Caption

Diffraction on a slit.A narrow slit is placed in the path of a Helium-Neon laser (632.8 nm) beam and the resulting diffraction pattern is observed some distance away. Two slits of different width are used, but the camera to slit distance is fixed. The extent of the pattern and the fringe spacing are smaller for the wider slit (top panel) than for the narrower slit (bottom panel). Note that in both cases the central lobe is oversaturated that allows to see the outer structure more prominently. This is a classic demonstration of the wave nature of the light.

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