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Where is the radius vector from p to any point on s

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Reference no: EM131110760

Let be a smooth parametric surface and let P be a point such that each line that starts at P intersects S at most once. The solid angle Ω(S) subtended by S at P is the set of lines starting at P and passing through . Let S(a) be the intersection of Ω(S) with the surface of the sphere with center P and radius a. Then the measure of the solid angle (in steradians) is defined to be

|Ω(s)| = areaf s(a) / a2

Apply the Divergence Theorem to the part of Ω(S) between S(a) and to show that

|Ω(s)| = ∫s∫ (r·n) ds / r3

where is the radius vector from P to any point on S, r = |r|, and the unit normal vector is directed away from P.

48_Solid Angle.jpg

Reference no: EM131110760

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