What is optical density?
a) it is the ratio of speed of light in two media.
b) it is the mass density of two media
c) its not depend on the composition of medium
d) it's ratio of speed of light in vacuum and denser medium
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A measure of the transmittance through an optical medium. 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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answer is (A)
option a is correct
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