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.docSOURCES OF LIGHT
There are different kinds of light sources, some of them are caused by high temperatures, others by some other factors.
Every source of light is known to have a luminous intensity, which is measurable. In general, the higher is the temperature of the source, the greater (is) the luminous intensity of the light it emits. At room temperature we see a piece of metal like platinum by the light it reflects. If we heat it until it reaches a sufficiently high temperature we can see then this piece of platinum even in a darkened room by the light it emits. Incandescence
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