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diff --git a/1026/CH8/EX8.11/Example8_11.sce b/1026/CH8/EX8.11/Example8_11.sce
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+//chapter8,Example8_11,pg 185
+
+//condition for dark is 2*u*t*cos(r)=n*lam
+
+lam=5890*10^-8
+
+u=1.5
+
+r=60*(%pi/180)
+
+//for n=1
+
+t=(lam)/(2*u*cos(r))
+
+printf("smallest thickness of glass plate\n")
+
+printf("t=%.8f cm",t)
+\ No newline at end of file