Nanometre

One millionth of a millimetre 1, or one billionth of a meter or 10 -9 of a meter.  Written as nm. Measurement used to describe wavelengths of light. Below 400nm are ultraviolet rays and above 700nm are the infrared rays.

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References

1 Case, D., 1985, Motion Picture Film Processing, Media Manuals, Focal Press, London, Boston