Question:
What is the SI Unit of brightness/illuminance
What is the SI Unit of brightness/illuminance
Updated On: Jul 16, 2025
- Candella
- Luminance
- Lumen
- Lux
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The Correct Option is D
Solution and Explanation
The SI unit of brightness or illuminance is known as Lux. Illuminance is a measure of how much luminous flux is spread over a given area. One lux is equal to one lumen per square meter. In other words, it quantifies the amount of light that hits a surface or is visible in a particular area.
Let's break down the options provided:
- Candella: This is a unit of luminous intensity, which measures the power emitted by a light source in a particular direction. It is not used to measure illuminance.
- Luminance: This refers to the intensity of light that is emitted or reflected from a surface in a specific direction per unit area. It is measured in units like candela per square meter, but it is distinct from illuminance.
- Lumen: This is a measure of the total amount of visible light emitted by a source. It is associated with luminous flux, not directly with illuminance.
- Lux: As stated above, this is the correct unit for measuring brightness or illuminance, capturing the amount of light that falls on a given surface.
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