"m " is the " optical mass " or " airmass factor ", a term approximately equal ( for small and moderate values of " ? " ) to 1 / cos " ? ", where " ? " is the observed object's optical thickness, which is necessary for the correction of satellite images and also important in accounting for the role of aerosols in climate.
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In physics, "'optical depth "'or "'optical thickness "', is the " natural logarithm " of the ratio of incident to " transmitted " radiant power through a material, and "'spectral optical depth "'or "'spectral optical thickness "'is the natural logarithm of the ratio of incident to " transmitted " dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero.
23.
In physics, "'optical depth "'or "'optical thickness "', is the " natural logarithm " of the ratio of incident to " transmitted " radiant power through a material, and "'spectral optical depth "'or "'spectral optical thickness "'is the natural logarithm of the ratio of incident to " transmitted " dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero.
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