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-rwxr-xr-x1397/CH8/EX8.7/8_7.sce7
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diff --git a/1397/CH8/EX8.7/8_7.sce b/1397/CH8/EX8.7/8_7.sce
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+//clc();
+clear;
+//To calculate fractional index change
+n1=1.5; //core refractive index
+n2=1.3; //cladding refractive index
+delta=(n1-n2)/n1;
+printf("fractional index change is %f",delta);