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$\begingroup$ Thanks for the wonderful answer. Could you please elaborate on why this isn't required in the case of cathode rays? I couldn't understand that quite well. $\endgroup$
– entropy
Commented May 14 at 15:39
$\begingroup$ @entropy Cathode rays are the result of discharging electrons on gas molecules (thus, i) light is seen already between anode and cathode, ii) there can be multiple/different sorts of charged molecules generated). Anode rays are the result of electron impact on the surface of a solid target (hence reference to the conventional X-ray tube, though I presume today it equally could be a liquid (microfocus / molten metal jet X-ray tube), too). $\endgroup$
– Buttonwood
Commented May 15 at 16:16
$\begingroup$ Right, thanks a lot. Makes a lot more sense now. Thanks for the time and effort. $\endgroup$
– entropy
Commented May 15 at 17:43

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