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diff --git a/3020/CH7/EX7.1/ex7_1.sce b/3020/CH7/EX7.1/ex7_1.sce
new file mode 100755
index 000000000..067d003c1
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+++ b/3020/CH7/EX7.1/ex7_1.sce
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+clc;
+clear all;
+lambda = 6000e-10; //Wavelength of light used in meters
+b = 1e-3; //Frindge width in meters
+theta = lambda/(2*b);//The exposure time
+disp('radian',theta,'The exposure time is')
+//Wrong answer printed in textbook... checked in calculator also..