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Which one of the following statements concerning nephelometry is correct?
• Nephelometry is the measure of the concentration of particles by measuring the amount of incident light blocked by the particles.
• In a nephelometric measurement, light blocked by solutes in the solution at 180° from the incident light is measured by a photodetector.
• The decrease in the intensity of scattered light is directly proportional to the number of particles in the solution, and the measurement of this decrease is called nephelometry.
• In a nephelometric procedure, the measurement of scattered light that is not in the direct path of the transmitted light is made at right angles to the incident light.