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11 relations: Exposure (photography), Frequency, Hertz, International System of Units, Irradiance, Joule, Partial derivative, Photometry (optics), Radiant energy, Radiometry, Wavelength.
Exposure (photography)
In photography, exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance.
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Frequency
Frequency is the number of occurrences of a repeating event per unit of time.
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Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
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International System of Units
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
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Irradiance
In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.
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Joule
The joule (symbol: J) is a derived unit of energy in the International System of Units.
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Partial derivative
In mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables, with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary).
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Photometry (optics)
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.
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Radiant energy
In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.
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Radiometry
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light.
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Wavelength
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
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