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+//Chapter-1,Example 1_9,Page 1-20
+clc()
+
+//Given Data:
+u1=1.3             //Refractive index of oil
+u2=1.5             //Refractive index of glass
+lam1=7*10^-7       //Wavelength of light
+lam2=5*10^-7       //Wavelength of light
+
+//Calculations:
+
+//for finding value of n, solve:
+//(2n+1)*lam1/2=(2(n+1)+1)*lam2/2
+//We get,n=2
+n=2
+
+toil=(2*n+1)*lam1/(2*u1*2)     //thickness of oil layer
+printf('Thickness of oil layer is =%.9f m',toil)