Q.Candela is the unit of which of the following?

  • AWavelength
  • BLuminous intensity
  • CLuminous flux
  • DFrequency
Correct Answer : (B)

Luminous intensity

Hints :

Candela is the unit of Luminous intensity.  Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. The SI unit of luminous intensity is Luminous flux per unit solid angle or Lumen per Steradian or Candela.


Luminous efficiency of a fluorescent tube is


Illumination of one lumen per sq. meter is called  ____________

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