classify the follwing light sources inter natural and artificial light sources
candle,sun,electrical bulb,stars,torch,firefly,tube light,fire.
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Light Sources
When we look at a leaf we know that it is green because light bounces off the leaf to our eyes to tell us that it is green. But what is light? Which are the sources of light from which light is originated? Light is electromagnetic radiation. A particular frequency of this radiation (around 390-700 nm) is visible to the human eye. Everything that we see around us is because of light. Light is a form of energy and like all energies, it is produced from a source. In Physics, these are called light sources.
Types of light sources
There are countless sources of light, but they can all be categorized under either of the two following categories-
•Natural sources
•Artificial sources
1)NATURAL SOURCE:
A light source is anything that makes light, whether natural and artificial. Natural light sources include the Sun and stars. Artificial light sources include lamp posts and televisions. Without light sources we could not see the world around us, however not every object we can see is a light source.
2) ARTIFICIAL SOURCE:
Sources of artificial light are of three main types: incandescent or arc lamps, lamps based on discharge of gas, and lights emitting diodes. ... The strength of illumination is measured in lumen units – the intensity of visible light as perceived by the human eye.
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