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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 9.3
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given
+Lambda0=0.63e-6;//Wavelength in m
+Deltan=6e-3;//Dimensionless Change in refractive index of titanium
+n1=2.286;//Ordinary dimensionless refractive index of Titanium 
+
+n2=n1-Deltan;//Changed dimensionless refractive index of titanium
+NA=sqrt(n1^2 - n2^2);//Corresponding dimensionless numerical aperture
+mprintf("\n NA = %.3f",NA);