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+clear
+//
+//
+//
+
+//Variable declaration
+n1=1.50 //Core refractive index
+n2=1.47 //Cladding refractive index
+
+//Calculation
+phic=asin(n2/n1) //critical angle(radian)
+phic=phic*180/%pi //critical angle(degrees)
+NA=sqrt(n1**2-n2**2) //numerical aperture
+phimax=asin(NA) //acceptance angle(radian)
+phimax=asin(NA)*180/%pi //acceptance angle(degrees)
+
+//Result
+printf("\n critical angle is %0.1f degrees",phic)
+printf("\n numerical aperture is %0.1f ",NA)
+printf("\n acceptance angle is %0.1f degrees",phimax)