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diff --git a/3840/CH11/EX11.11/Ex11_11.sce b/3840/CH11/EX11.11/Ex11_11.sce
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+clear
+//
+//
+//
+
+//Variable declaration
+n1=1.50          //Core refractive index
+delta=4/100      //fractional index change
+
+//Calculation
+n2=n1-(delta*n1)             //Cladding refractive index
+NA=sqrt(n1**2-n2**2)    //numerical aperture
+theta0=asin(NA)         //acceptance angle(radian)
+theta0=theta0*180/%pi     //acceptance angle(degrees)
+theta0m=60*(theta0-int(theta0)) //acceptance angle(minutes)
+thetac=asin(n2/n1)      //critical angle(radian)
+thetac=thetac*180/%pi     //critical angle(degrees)
+thetacm=60*(thetac-int(thetac)) //critical angle(minutes)
+
+//Result