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diff --git a/3020/CH7/EX7.4/ex7_4.sce b/3020/CH7/EX7.4/ex7_4.sce
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+clc;
+clear all;
+n = 200; // Number of fringes observed
+d = 0.589e-3; // Distance moved
+lambda = (2*d)/n; // Condition for interference is
+disp('m',lambda,'The wavelength of light used is')
+lamda=lambda*1e10;//conversion in Angstrome
+disp('Angstrom',lamda,'The wavelength of light used is ')
+//rounding off value of lambda in meter due to scilab..
+//there is mistake in the answer of book.. checked in calculator also..
+