What do you mean by optical density?

Asked by  | 14th Sep, 2008, 01:10: PM

Expert Answer:

In optics, density is a unitless measure of the transmittance of an optical element for a given length at a given wavelength λ:

O = the per-unit opacity
T = the per-unit transmittance
I0 = the intensity of the incident light beam
I = the intensity of the transmitted light beam

The higher the optical density, the lower the transmittance.

Answered by  | 15th Sep, 2008, 07:32: AM

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