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Q: What is the unit of the physical quantity, Illuminance?
  • A. siemens
  • B. tesla
  • C. lux
  • D. weber
Correct Answer: Option C - The luminous flux on the unit area of a surface is called the illuminated density of that surface. Its unit is lumen/m² in M.K.S. It is also called lux. Whereas, CGS unit is fot. 1 fot = 10⁴ lux
C. The luminous flux on the unit area of a surface is called the illuminated density of that surface. Its unit is lumen/m² in M.K.S. It is also called lux. Whereas, CGS unit is fot. 1 fot = 10⁴ lux

Explanations:

The luminous flux on the unit area of a surface is called the illuminated density of that surface. Its unit is lumen/m² in M.K.S. It is also called lux. Whereas, CGS unit is fot. 1 fot = 10⁴ lux