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+//Example number 7.8, Page number 7.16
+
+clc;clear;close
+
+// Variable declaration
+lamda=0.58 // in m
+theta1=6.45*%pi/180 // in radian
+theta2=9.15*%pi/180 // in radian
+theta3=13*%pi/180 // in radian
+
+// Calculations
+dbyn1=lamda/(2*(sin(theta1))) // in Angstrom
+dbyn2=lamda/(2*sin(theta2))// in Angstrom
+dbyn3=lamda/(2*sin(theta3))// in Angstrom
+
+// Results
+printf("i. d/n = %.3f Angstroms ",dbyn1)
+printf("\nii. d/n = %.3f Angstroms",(dbyn2))
+printf("\niii.d/n = %.3f Angstroms",(dbyn3))