A As shown in the figure above a thin beam of white light is incident on a glass prism forms a spectrum ranging between Y and X Write the Principle involved. Write the name of the coloured rays X and Y. X Using the above data clarify scientifically as to which colour light is used as a danger signal
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(i) Dispersion of light through prism ,the principle involved is double refraction of white light
(ii)Y is red light and X is violet light
(iii)Red colour light (Y) is used as danger signal
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