condition for formation of pure spectrum
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a a very narrow slit should be kept in front of the slit so that a narrow pencil of light strike the refracting face of the prism
vidhitiwari15:
the prism should be adjusted in the minimum deviation positions because in this position there is a least chance of overlapping of different colour
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a spectrum in which the dispersion is highly discriminative so that at each point the light is practically monochromatic.
The spectrum in which the constituent colours overlap and no colour has its clear boundary line is called impure spectrum.
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