... account that in some zones of wave lengths the optical density of n-pentane increases and in some others decreases. The total error is determined as a weighted sum of error of measuring of polystyrene particles depending on radius of partyicles and error of measurements of asphalten dissolved in n-pentane. The research task is selection of such optimum zones of wavelengths for above measurements where the errors of appropriate measurements changes in anti-phase order depending on wavelength and ...

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