General Knowledge - Physics - Discussion

Discussion :: Physics - Section 1 (Q.No.25)


Lux is the SI unit of

[A]. intensity of illumination
[B]. luminous efficiency
[C]. luminous flux
[D]. luminous intensity

Answer: Option A


The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.

Binu said: (Apr 11, 2013)  
Intensity of illumination is also called as luminous intensity which is option D.

Satish said: (Oct 17, 2016)  
But in SI system, Candela is the unit of luminous intensity.

Anil said: (Jul 28, 2017)  
Good, thanks @Satish.

Jagga said: (Aug 17, 2017)  
Luminous efficiency SI unit is lumens/ watt.

Luminous flux SI unit is lumens.

Ogechi said: (Nov 24, 2017)  
What is the formulae for the intensity of illumination?

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