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+// Chapter 5 Example 4

+//==============================================================================

+clc;

+clear;

+

+//input data

+lamda   = 1.5418;       // wavelength in Å

+h       = 1;            // miller indice

+k       = 1;            // miller indice

+l       = 1;            // miller indice

+n       = 1;            // given first order

+theta   = 30;           // diffraction angle in degrees

+

+// Calculations

+theta1   = theta*%pi/180;   // degree to radian conversion

+// d     = (n*lamda)/(2*sinθ);    by Braggs law               ------------- 1

+// d     = a/sqrt((h^2)+(k^2)+(l^2));  interplanar distance    ------------ 2

+// equating 1 and 2

+

+a       = (n*lamda*sqrt((h^2)+(k^2)+(l^2))/(2*sin(theta1)))

+

+// Output

+mprintf('Interatomic spacing a = %f Å',a);

+//==============================================================================