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+clear
+//
+//
+//
+
+//Variable declaration
+n1=1.48 //Core refractive index
+n2=1.45 //Cladding refractive index
+
+//Calculation
+NA=sqrt(n1**2-n2**2) //numerical aperture
+thetamax=asin(NA)*180/%pi
+thetamaxd=int(thetamax) //angle of acceptance(degrees)
+thetamaxm=60*(thetamax-thetamaxd) //angle of acceptance(minutes)
+
+//Result
+printf("\n numerical aperture is %0.4f ",NA)
+printf("\n angle of acceptance is %0.3f degrees %0.0f minutes",thetamaxd,thetamaxm)