Lenard Ray Definition
noun
One of the rays that emanate from the outer surface of a plate composed of any material permeable by cathode rays, such as aluminium , which forms a portion of a wall of a vacuum tube , or which is mounted within the tube and exposed to radiation from the cathode .
Wiktionary
Origin of Lenard Ray
Named after the German physicist Philipp Lenard, who first described them.
From Wiktionary
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