Gene Mechtly wrote:
> The correct submultiple is "nanometer" symbol "nm" for optical lengths.
There is no reason to state that nanometres are "for optical lengths". The
nanometre is a perfectly proper unit for ANY very small length whether it is
related to optical properties or not.
It is true that measuring the wavelengths of light is one of the commoner
uses for the nanometre but it is hardly the only use to which it may be put
or is put.
Perhaps Gene simply meant that such very small lengths are sometimes called
"optical lengths" because they are of the order of the wavelengths of light,
but the way he stated it seemed (to me, at least) to suggest that they could
be used only for measuring optical properties.
Regards,
Bill Hooper
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Keep It Simple!
Make It Metric!
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