Which of the following can be measured by photometer?

Illuminance

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Irradiance

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Fluorescence

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All of the above

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Solution

The correct option is D All of the above
A photometer is an instrument that measures the strength of electromagnetic radiations in the ultraviolet, visible and the infrared spectrum. Most of the photometers convert light into electric current with the help of a photoresistor. photodiode or a photomultiplier.
So, the correct answer is 'All of the above'

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