Definition of optical density

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Photonics Dictionary

optical density: A measure of the transmittance through an optical medium. Optical density equals the log to the base 10 of the reciprocal of the transmittance.

where τ_λ is transmittance. In spectroscopy, optical density is the measure of absorbance, and is defined as the ratio of the intensity of light falling upon a material and the intensity transmitted. Abbreviation OD.

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