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Answer for the clue "Electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons ", 8 letters:
orthicon

Alternative clues for the word orthicon

Word definitions for orthicon in dictionaries

Wiktionary Word definitions in Wiktionary
n. TV camera tube. ((abbreviation of orthoconoscope English)

WordNet Word definitions in WordNet
n. a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons [syn: image orthicon ]

Usage examples of orthicon.

There were no moving parts and the screen and orthicon were of the nonvacuum Partini type.

I cut out the radar and cut in the nose orthicon and sat back to watch the beacon appear on the screen.