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+// Scilab code Ex2.1: Pg:55 (2008)
+clc;clear;
+V1 = 250;    // Accelerating potential of electron in first region, volts
+theta1 = 50;    // Angle of incidence, degrees
+theta2 = 30;    // Angle of refraction, degrees
+// According to Bethe's law  sind(theta1)/sind(theta2) = []V2/V1]^1/2
+// On solving for V2
+V2 = V1*(sind(theta1)/sind(theta2))^2;    // Potential in second region, volts
+deltaV = (V2-V1);    // Potential difference between two regions, volts
+printf("\nPotential difference between two regions of an electric field = %5.1f V", deltaV);
+
+// Result 
+// Potential difference between two regions of an electric field = 336.8 V 
+\ No newline at end of file