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diff --git a/1535/CH11/EX11.6/Ch11Ex6.sci b/1535/CH11/EX11.6/Ch11Ex6.sci
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+// Scilab Code Ex11.6:Page-251 (2010)
+lambda = 693e-009;    // Wavelength of laser beam, m
+D = 3e-003;    // Diameter of laser beam, m
+d_theta = 1.22*lambda/D;    // Angular spread of laser beam, rad
+d = 300e+003;    // Height of a satellite above the surface of earth, m
+a = d_theta*d;    // Diameter of the beam on the satellite, m
+printf("\nThe height of a satellite above the surface of earth = %4.2e rad", d_theta);
+printf("\nThe diameter of the beam on the satellite = %4.1f m", a);
+
+// Result
+// The height of a satellite above the surface of earth = 2.82e-004 rad
+// The diameter of the beam on the satellite = 84.5 m 
+\ No newline at end of file