clear;
clc;
printf("\nEx1.15\n");
//page no.-25
//given
theta=12;.......//angle in degrees
n=1;............//order of spectrum
d=3.035;....//interatomic spacing in angstrom

lambda=(2*d*sind(12))/n.........//wavelength in angstrom

printf("\nwavelength of X ray beam is 1.262 angstrom\n");