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+// Scilab Code Ex4.2: Page:191 (2011) 
+clc;clear;
+r = 1;  // For convenience assume radius of the circle to be unity, unit
+alpha = 0.8*r;  // Distance of light source from the centre of the spherical shell, unit
+cos_phi_by_2 = sqrt((alpha+1)/(4*alpha));
+printf("\ncos(phi/2) = %d/4", cos_phi_by_2*4);
+
+// Result
+// alpha^2+1-2*alpha*cosine('phi')
+
+