define optical density?
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Answer:
the degree to which a refractive medium retards transmitted rays of light.
Explanation:
The optical density of a substance is the logarithmic ratio of the intensity of transmitted light to the intensity of the incident light passing through the substance. It is otherwise measured as the absorbed radiation of the corresponding wavelength. Optical density refers to the absorbance of a substance
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the degree to which a refractive medium retards transmitted rays of light.
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