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composed are deflected to different extents–
the violet most, the red least. The number
of colours forming images is so numerous
as to form a continuous spectrum on the
wall with all the colours–red, orange, yel-
low, green, blue, indigo, and violet. But
Frauenhofer found with a narrow slit, well
focussed by the lens, that some colours were
missing in the white light of the sun, and
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