what is the origin of positive rays?
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An anode ray (also positive ray or canal ray) is a beam of positive ions that is created by certain types of gas-discharge tubes.
They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886. Later work on anode rays by Wilhelm Wien and J. J.
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Your teacher was absolutely right, because anode rays are not generated from anode.
They are the result of fast-moving cathode rays that strike the gas molecules. They knock out electrons from gas molecules and thus become positive ions which start moving towards the cathode.
They are called positive rays due to their positive charge and canal rays as they were passed through a perforated cathode or canal.
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