What are differrent sources of light? How are they classified?
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Answer:-
#Types of light sources:
There are countless sources of light but they can all be categorized under either of the two following categories-
(i)Natural sources
(ii)Artificial sources
1. Natural Light Sources:
*The universe is filled with objects that emit light. Some of the light from these sources reach the earth. The following things in nature have the ability to emit light:
(i) The Sun is the major source of light for the earth. The sun is a massive ball of fire, at the centre of which nuclear fusion produces massive energy. This energy comes out as heat and light. The light from the sun is one of the major factors behind the sustainability of life on earth.
(ii) Every other star produces light too, but only a small or no amount of it reaches the earth because of the huge distance.
(iii) The moon provides light as well but it cannot produce light on its own. The light that we get from the moon is the light reflected by it from the sun.
(iv) Some living organisms have the ability to produce light too. It is called bioluminescence. It is the effect of certain chemical reactions within the organism. Fireflies, jellyfish, glow worm, certain deep sea plants and microorganisms can be cited as examples.