explain the solid angle and lumen ?☺️
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Lumen, unit of luminous flux, or amount of light, defined as the amount streaming outward through one steradian (a unit of solid angle, part of the volume of space illuminated by a light source) from a uniform point source having an intensity of one candela.
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The entire sphere has a solid angle of 4πsr. The steradian (symbol: sr) or square radian is the SI unit of solid angle. It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles.
The lumen is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time.
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