dimensioonita suurus, mis iseloomustab optilise kiirguse nõrgenemist neeldumisel ja hajumisel aines
a measure of the light-stopping power of a transparent material; it is defined as the logarithm of the opacity, which is the reciprocal of the transmission ratio
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DE: optische Dichte [T45102]
FR: densité optique [T45102]
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