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Lloyd Godman
The visual spectrum ranges from deep blue
to deep red and sits on a larger spectrum from
Gamma rays to radio waves
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But what we regard as "white " light is really a mixture of Colours with differing wave lengths.
| By passing a beam of sunlight through a glass prism, it is possible to split the light into its component colours because short wave lengths are bent more than longer wave lengths. The light beam therefore fans out into a band of recognizable rainbow colours. |  |
| If the band of spectrum colours are then directed through a second prism, they bend back to the same degree, recombine, again forming white light. |  |
| If any colour band is blocked off before it enters the second prism, the reformed light is too incomplete. This is because the other colours are absorbed and not allowed to pass. While an opaque object could be used to block these colours, a suitable colour filter could also be used. |
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