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+clc;clear;
+//Example 5.1
+//Electron refraction, calculation of potential difference
+
+//given values
+ V1=250;//potential by which electrons are accelerated in Volts
+ alpha1=50*%pi/180;//in degree
+ alpha2=30*%pi/180;//in degree
+b=sin(alpha1)/sin(alpha2);
+ //calculation
+V2=(b^2)*V1;
+a=V2-V1;
+disp(a,'potential difference(in volts) is:');
+
+