An electron of velocity V enters in uniform magnetic field of strenght,the magnetic feild acting on electron is given, F=0 (sinA=0 [angle=0*])

motion of electron in trensverse magnetic field B and it is entered with velocity V,therefore F=eVB (sinA=90)

An electron is moving with velocity V in uniform magnetic field with angle A and the magnetic field acting in components(X and Y).

D=LlB(e/2mVa)^1/2

magnetic deflection sensitivity S=D/B

Deflection Factor = reciprocal of magnetostatic deflection sensitivity.

sinA/sinB=V1/V2=(potential deference 1/potential deference 2)^1/2.