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+clc;clear;
+//Example 7.4
+//nonreflecting film
+
+//given values
+l=5500*10^-10;//wavelength of light
+n1=1.33;//refractive index of water
+n2=1.52;//refractive index of glass window pane
+x=sqrt(n1);//to check if it is nonreflecting
+
+ //calculation
+t=l/(4*n1);//thickness of water film required
+disp(t*10^6,'minimum thickness of film (in metre) is');
+\ No newline at end of file