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//chapter10,Example10_9,pg 274
V1=200
//electrostatic focusing condition
//(sini/sinr)=(v2/v1)=sqrt(V2/V1)
//0.5mv2=eV
i=60*(%pi/180)//converting into radian
r=45*(%pi/180)//converting into radian
V2=200*((sin(i)/sin(r))^2)
pd=V2-V1//potential difference
printf("potential difference between two region\n")
printf("\npd=%.2f Volts",pd)
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