Question: Let Ω s be the solid angle subtended by the source when viewed from the center of the aperture screen. Show that represents the coherence

Let Ωsbe the solid angle subtended by the source when viewed from the center of the aperture screen. Show that

Ac Ω, Σ

represents the coherence area. This equation is useful when we don€™t know the distance to the source. Notice that the smaller the source, the larger is the coherence area.

Ac ,

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