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diff --git a/1694/CH1/EX1.16/EX1_16.sce b/1694/CH1/EX1.16/EX1_16.sce
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+clear;
+clc;
+printf("\nEx1.16\n");
+//page no.-26
+//given
+//For <111> planes
+h=1;
+k=1;
+l=1;
+n=1;.....//order
+theta=30;......//angle in degrees
+lambda=1.75;....//wavelength in angstrom
+
+//we know d=a/sqrt((h^2)+(k^2)+(l^2))........distance between planes
+
+//also by bragg's law 2*d*sind(theta)=n*lambda......put d values in this
+
+a=(n*lambda*sqrt((h^2)+(k^2)+(l^2)))/(2*sind(theta))......//interatomic spacing in angstrom
+
+printf("\nInteratomic spacing is 3.031 angstrom\n"); 
+
+