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Mention two main points about light....

Mention two main points about light.

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There are two things about light :
(i) It travels with enormous speed and its presently accepted value in vacuum is `c = 2.99792458 xx 10^8 ms^(-1)`. For practical purpose, `c = 3 xx 10^8 ms^(-1)` it is the highest speed attainable in nature.
(ii) Light travels in a straight line.
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