#photoelectric_cell__photoelectriccell__photoconductive_cell__photoconductivecell__photocell__electric_eye__magic_eye__magiceye  a transducer used to detect and measure light and other radiations
  supertype:  transducer  sensor
  subtype:  selenium_cell  a photoelectric cell that uses a strip of selenium
  part:  photocathode  a cathode that emits electrons when illuminated

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