The incident white light ray separates into its constituent colours upon refraction
Light is measured with two main alternative sets of units: radiometry consists of measurements of light power at all wavelengths, while photometry measures light with wavelength weighted with respect to a standardized model of human brightness perception. There are different SI units for both systems.
The photometry units are different from most systems of physical units in that they take into account how the human eye responds to light. Photometry is useful, for example, to quantify Illumination (lighting) intended for human use.
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