Answers

2014-05-17T09:51:07+05:30
Spectra is the set of colours into which a beam of light can be separated from a spectral light while spectrum is the plural of spectra.
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2014-05-17T09:56:02+05:30
Spectrum is distribution of colours produced when white light is dispersed by a prism or diffration grating and spectrum  is a plural of spectra
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