Even though the coherence area increases as Icirc pound Icirc plusmn moves away from Icirc pound s , there is a quantity that doesnt change thats the solid angle Icirc copy c subtended by the coherence area at the center of the source Justify the expression for a distant object like a star As Icirc...

Even though the coherence area increases as Î£ Î± moves away from Î£ s , there is

Question:

Even though the coherence area increases as Î£_Î±moves away from Î£_s, there is a quantity that doesn€™t change; that€™s the solid angle Î©_csubtended by the coherence area at the center of the source. Justify the expression

for a distant object like a star. As Î£_Î±moves away from Î£_s, it intersects the cone of the solid angle, leading to larger and larger values of A_c.

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