A refractometer is used to measure which property of a liquid?

A refractometer is used to measure which property of a liquid?

• A. Volume
• B. Temperature
• C. Refractive index
• D. Viscosity

Answer: (C)

A refractometer measures how light bends when it enters the liquid, which is quantified as the refractive index. This optical property reflects the liquid’s composition and concentration, not the amount of liquid (volume), the temperature, or how easily the liquid flows (viscosity). The instrument uses this bending, via Snell’s law, to display the refractive index, which can then be correlated with concentration or purity in practical applications. Temperature can slightly affect refractive index and some devices compensate for it, but the reading you get is fundamentally the refractive index.

A refractometer measures how light bends when it enters the liquid, which is quantified as the refractive index. This optical property reflects the liquid’s composition and concentration, not the amount of liquid (volume), the temperature, or how easily the liquid flows (viscosity). The instrument uses this bending, via Snell’s law, to display the refractive index, which can then be correlated with concentration or purity in practical applications. Temperature can slightly affect refractive index and some devices compensate for it, but the reading you get is fundamentally the refractive index.