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The optical instrument used for the comparison of candle power of different sources are known as

  • The optical instrument used for the comparison of candle power of different sources are known as Photometer.
  • A photometer is an optical instrument that is used to measure the intensity of light, as well as to compare the brightness or luminosity of different light sources.
  • In photometry, the unit of measurement for luminous intensity is the candela (cd), which is a measure of the power emitted by a light source in a particular direction.
  • A photometer typically consists of a light-sensitive sensor or detector, a lens system for focusing the light, and an electronic display or readout for measuring the intensity of the light.