Consider this diagram of a focusing anode in a CRT: enter image description here

Question: Why does the electron beam not diverge again when it enters the focussing anode (or accelerating anode) while leaving the pre-accelerating anode (or focussing anode)?

I think the answer is that it does diverge but less than it converges at both entrances. And since it converges first, the resultant is relatively convergent. The following is how I show it: enter image description here

Is it correct?


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