What Factors Affect Electron Beam Deflection in a Cathode Ray Oscilloscope?

[hms.tech]

Homework Statement

This question is related to thermionic emmision in a cathode ray oscilloscope. I don't understand what factors affect the amount of deflection of the beam of electrons.
1.The size of the plates
2.The P.D accros the deflecting plates.
3.The length of the plates
4.Any other factors
I would very much appreciate if reasons to the factors are also provided...ie why does (some) particular factor affects the amount of deflection.

Homework Equations

The Attempt at a Solution

 

[supratim1]

i don't think the first 3 factors have any role to play in deflecting electrons.