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+//Example 5_15
+clc();
+clear;
+//To calculate the Braggs angle 
+h=6.63*10^-34      //Plancks Constant
+m=9.1*10^-31
+e=1.6*10^-19
+v=80
+lamda=h/sqrt(2*m*e*v)            //units in mts
+lamda=lamda*10^9       //units in nm
+a=0.35         //units in nm
+h=1
+k=1
+l=1
+d111=a/sqrt(h^2+k^2+l^2)        //units in nm            //units in nm
+theta=asin(lamda/(2*d111))              //units in radians
+theta=theta*180/%pi                  //units in degrees
+printf("Braggs angle is theta=%.2fDegrees or 19Degrees40Minutes",theta)