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Mention any two importance of speed of l...

Mention any two importance of speed of light.

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(i) To calculate the frequency, wavelength of electromagnetic wave using `c = flambda`.
(ii) To calculate the refractive index of the medium
`n=(c)/(v)`
(iii) In Einstein.s mass-energy relation `E = mc^(2)`
(iv) To determine the relativistic mass in theory of relativity.
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