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+//Example 2_9
+clc();
+clear;
+//To calculate resolving power in second order
+//We have e*sin(theta)=k*lamda
+//We have e*0.2=k*lamda       ->1
+//And e*0.3=(k+1)*lamda        ->2
+//Subtracting one and two 3*0.1=lamda
+lamda=5000         //units in armstrongs
+lamda=lamda*10^-8   //units in cm
+e=lamda/0.1     //units in cm
+width=2.5       //units in cm
+N=width/e
+respower=2*N
+printf("Resolving power is %.f",respower)