Optics logoSubject: Physics    Exam: AIIMS

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Important Points

A photometer is used for comparing the luminous intensities of two sources. It is based on the property of human eye that it can detect whether two given surfaces are equally bright or not.
Phot is the unit of intensity of illumination of the surface.
Source of light are of three types : Thermal sources; Gas discharge sources and luminescent sources.
A substance which emits luminescence is called a phosphor.
Luminescence produced by chemical reaction is called chemi-luminescence and by biochemical reaction is called bioluminescence.
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