Answer to Question #12256 in Optics for dinesh
Coherence can be classed in two ways: spatial and temporal coherence. Spatial coherence refers to all the light along the surface of an emitter being in phase: imagine a solid sphere where all the light leaving every part of the surface is perfectly in phase. Temporal coherence pertains to all the waves being perfectly in step at all times so that, if the phase is measured at some time t = 0, and is found to be identical for all the emitted light, the light beam can be said to be temporarily coherent.
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