When the light slows down, it also changes direction and changes the reading produced by the refractometer. Notify me of follow-up comments by email. The shorter the wavelength of the light, the higher its speed.
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This frequency dependency of the refractive index is known as dispersion and causes a prism or a rainbow where the light travels from air through water to divide white light into its constituent spectral colors. Often the refractive index is used for concentration determinations in binary mixtures.
Refractometer has bee use for many years in these industries. It is used to measure the brix in the juice, jelly, food additives, food pigments, flavors. The samples are thermostated.
The prism in the refractometer has a greater refractive index than the solution. It is important to know that it takes a while until the temperature distribution in the sample is homogeneous once it is applied to the measuring cell. The refractometer is then brought up to the observer's eye and held perpendicular to a light source.
By Taylor Echolls; Updated April 24, 2017.
This physics phenomenon is known as "Refraction". When light enters a liquid it changes direction; this is called refraction.
Spectrometer Experiments. Refractometer is an optical device that can be used to measure the refractive index of a substance usually fluid and, by converting the refractive index, one can get the specific gravity, sugar content Brix, or Plato. When light enters from a medium with a lower refractive index as for example air into a medium with a higher refractive index as for example water it thus changes its speed. Pure water with no suspended solids has a Brix value of zero, while water with sugars, minerals or other solids in solution refracts light to produce a higher Brix value.
Karen Danko March 30, 2017 at 10: A refractometer takes the refraction angles and correlates them to refractive index nD values that have been established.