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+//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999
+//Example 21.7
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+//given
+nf=1.51;//refractive index of film
+ns=1.50;//refractive index of substrate
+nc=1.0;//refractive index of cover
+d=4e-6;//thickness of film in m
+lambda0=0.6e-6;//Wavelength in m
+ne1=1.50862;//Corresponding effective refractive index for core
+ne2=1.5046;//Corresponding effective refractive index for cladding
+//Let A be the perturbation of length in m
+A=0.2e-6;
+
+//Rearranging the terms of the equation 'ne1-lambda0/A=ns*cos(Thetas0)', we get:
+Thetas0=acosd((ne1-lambda0/A)/ns);
+mprintf("\n Thetas0 = %.1f degrees",Thetas0);
+
+//Rearranging the terms of the equation 'ne2-lambda0/A=ns*cos(Thetas1)', we get:
+Thetas1=acosd((ne2-lambda0/A)/ns);
+mprintf("\n Thetas1 = %.1f degrees",Thetas1);