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Persistence of vision is the principle behind?

  • A.Cinema
  • B.Camera
  • C.Periscope
  • D.Spectroscope

Answer: A

Persistence of vision is the principle behind cinema.

An image lingers on the retina for about a sixteenth of a second after the light is cut off, so still frames shown faster than that merge into apparently continuous motion. Film runs at 24 frames a second for this reason.

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