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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 6.7
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+Lambda=10.6e-6;//Wavelength of the laser in m
+f=200e-3;//Focal length of the lens in m
+D=50e-3;//Diameter of aperture of focusing lens
+
+rs=2*Lambda*f/(%pi*D);//Radius of the focused spot in m
+mprintf("\n rs = %.1f um",rs/1e-6);//Dividing by 10^(-6) to convert to um
+//The answers vary due to round off error
+
+//Let the ratio w(z)/w0 be w
+w=1.1;
+w0=rs;//Also given
+
+z=%pi*w0^2/Lambda*sqrt((w^2)-1);//Depth of focus in m
+mprintf("\n z = %.2f mm",z/1e-3);//Dividing by 10^(-3) to convert to mm
+//The answers vary due to round off error