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Zurich Instruments AG - Lock-In Amplifiers 4/24 LB
Photonics Dictionary

halo

1. The faintly hued ring that is seen to surround a light source viewed through fog or light clouds. The size of scattering particles determines the size of the ring. 2. The ring surrounding a photographic image of a bright source and resulting from the scattering of light in random directions.
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