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diff --git a/1694/CH1/EX1.25/EX1_25.sce b/1694/CH1/EX1.25/EX1_25.sce
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+++ b/1694/CH1/EX1.25/EX1_25.sce
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+clear;
+clc;
+printf("\nEx1.25\n");
+//page no.-35
+//given
+lambda=0.071*10^-9;.........//wavelength in m
+h=1;
+k=1;
+l=0;
+a=0.28*10^-9;........//lattice constant in m
+n=2;.................//order
+
+d=a/sqrt(h^2+k^2+l^2);..........//interplanar spacingin m
+//by bragg's law
+
+theta=asind((n*lambda)/(2*d)).......//angle in degrees
+
+printf("\nangle is 21.01 degrees\n");