Diffraction on a Slit,1 of 3

Numéro d’image : 12017086
Diffraction on a Slit,1 of 3
Diffraction on a slit,Photo 1 of 3. A narrow slit is placed in the path of a laser beam and the resulting diffraction pattern is observed some distance away. In this series the camera to slit distance is fixed. Photo 1 and Photo 2 use two different Helium-Neon lasers,red (632.8 nm) and green (543.4 nm),illuminating the same slit. Note the extent of the pattern and the fringe spacing are smaller for shorter wavelength. Photo 3 uses the same red laser as Photo 1,but the slit width is narrower. Note the wider pattern and the increased fringe spacing in Photo 3 compared to Photo 1. Also note that in all photos the central lobe is oversaturated which allows to see the outer structure more prominently. This is a classic demonstration of the wave nature of
Licence : Droits gérés
Crédit: Science Photo Library / Giphotostock
Taille de l’image : 5060 px × 3372 px
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