On Saturday, February 2, 2019 at 12:26:27 AM UTC, Roger Hayter wrote:
NY wrote:

"Roger Hayter" wrote in message
...
Light frequencies, and especially infrared, are often still described as
a wavelength in nanometres.

Whereas at one time they were quoted in Angstroms - when 1 ? is 0.1 nm or
100 pm.

I remember them! I came across them regarding X-rays, I don't know if
they are still used in that field.


--

Roger Hayter

In our lab at BP we quoted small wavelengths in nanometres.