A non-SI unit called 'nit' is the unit of which of the following photometric quantities used to measure a multitude of light intensity?

The correct answer is Luminance.

 Key Points

• Luminance:-
  • It refers to the amount of light that is emitted, reflected, or transmitted from a surface, object, or scene.
  • It is a measure of the brightness of light and is often used in the context of visual perception, photography, and various fields of science and technology.
  • Luminance is typically measured in units called "candelas per square meter" (cd/m²) or "nits." It represents the intensity of light as perceived by the human eye. In simpler terms, it is how bright an object appears to an observer.

Additional Information

• Luminous exposure:-
  • It often referred to simply as "exposure," is a concept used in photography and lighting design to quantify the total amount of light that falls onto a photographic film or image sensor in a camera, or onto a surface in a lighting scenario.
  • It is a fundamental concept in understanding how light affects the outcome of an image or the illumination of a scene.
• Luminosity:-
  • It refers to the total amount of energy radiated by an object or source in the form of electromagnetic radiation, typically including visible light and other forms of energy like infrared and ultraviolet radiation.
  • It's a measure of the overall brightness or total energy output of an object, often used in astronomy and physics to describe the intrinsic brightness of celestial bodies.
• Luminous emittance:-
  • ​Luminous emittance, also known as luminous exitance, is a term used in lighting and radiometry to describe the amount of visible light emitted or radiated from a surface per unit area.
  • It is a measure of the brightness or luminous output of a surface and is commonly denoted by the symbol "M" or "Mv" and is measured in units of lumens per square meter (lm/m²) or lux (lx).