Question

A is an atificial source of light​

Answer 1

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Sources of artificial light are of three main types: incandescent or arc lamps, lamps based on discharge of gas, and light-emitting diodes. ... The strength of illumination is measured in lumen units – the intensity of visible light as perceived by the human eye.

Answer 2

Answer:

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Explanation:

Sources of artificial light are of three main types: incandescent or arc lamps, lamps based on discharge of gas, and light-emitting diodes. ... The strength of illumination is measured in lumen units – the intensity of visible light as perceived by the human eye.