Question
Thu November 24, 2011 By: Febna Rasheed

What is meant by optical density?

Expert Reply
Thu November 24, 2011
Optical density is the measure of the transmission of an optical medium for a given wavelength.Higher OD lower transmittence and vice versa e.g; optical density of 1 means 90% of incident light is absorbed

Optical density is the absorbance of an optical element for a given wavelength ? per unit distance:

Where:

the distance that light travels through the sample (i.e., the sample thickness), measured in cm A?

the absorbance at wavelength ? T
the intensity of the incident light beam I = the intensity of the transmitted light beam
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