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+// Scilab code Ex3.5 : Pg:98 (2008)
+clc;clear;
+d = 10;    // Distance of separation of two lenses, cm
+// As 2*f1 = d, solving for f1
+f1 = d/2;    // Focal length of the first plano-convex lens, cm
+f2 = 3*f1;    // Focal length of the second plano-convex lens, cm
+F = f1*f2/(f1 + f2 - d);    // Focal length of the eye-piece, cm
+printf("\nThe focal lengths of the plano-convex lenses are %1.0f cm and %2.0f cm", f1, f2);
+printf("\nThe focal length of the eye-piece = %3.1f cm", F);
+
+// Result 
+// The focal lengths of the plano-convex lenses are 5 cm and 15 cm
+// The focal length of the eye-piece = 7.5 cm 
+\ No newline at end of file