A narrow beam of white light passes through a prism and is dispersed into a spectrum.
Which row is correct?

1 )
colour 1:blue / colour 2:yellow / colour 3:red
2 )
colour 1:red / colour 2:blue / colour 3:yellow
colour 1:red / colour 2:yellow / colour 3:blue
4 )
colour 1:yellow / colour 2:blue / colour 3:red
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