Question

Why is speed of light is constant.

Answer 1

Hi.

Something's in nature can't be changed. Some are accepted just as it is. These are discoveries or existence. May be a manifestation of some supreme power of Universe.

Coming technically, light is an form of energy in the form of electromagnetic radiation. All electromagnetic radiations actually gets transferred, which is called as Radiation with merely same speed. As in your question, speed of light is not always constant but lies in approximation. Speed varies when it travels in different mediums depending on factors like Refractive index, density etc.

Hope this cleared your doubt.

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