In photographic quality assurance, logarithms are used to determine, for instance, the density. Density is the common
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In photographic quality assurance, logarithms are used to determine, for instance, the density. Density is the common logarithm of the opacity, which is the quotient of the amount of incident light and the amount of transmitted light. What is the density of a photographic material that only transmits 90% of the incident light?
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