Refractive index is a measure of how light propagates through a material. Determining the refractive index of biological matter is needed for biophotonics applications including laser therapy, optical diagnosis and biomedical imaging. Refractive index also called the index of refraction describes how fast light travels through the material. Refractive index is a measure of how much speed of light changes when it enter the medium from air. For a given material, the refractive index is the ratio between the speed of light in a vacuum (c) and the speed of light in the medium (v). Refractive Index is dimensionless. Refractive Index. Sine R is the sine of the angle of refraction. It is measured using an instrument known as a refractometer.. The refractive index (often abbreviated RI) is an optical property that refers to the ratio of the speed of light in a vacuum to the speed of light through a transparent medium. The Refractive Index - n - of a medium is a measure for how much the velocity of light is reduced inside the medium. The higher the refractive index the slower the light travels, which causes a correspondingly increased change in the direction of the light within the material. A refractive index is a numerical value that indicates the way in which light will travel through a particular substance in relation to how it travels through a vacuum. Absolute refractive index is the ratio of â¦ The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium.For example, typical soda-lime glass has a refractive index of 1.5, which means that in glass, light travels at $1/1.5=0.67$ times the speed of light in a vacuum. The velocity of light in a medium can be expressed as Sine I is the sine of the angle of incidence, and . Refractive index definition, index of refraction. In gemology, refractive index is one of the chief means of identifying a gemstone. Refraction is an effect that occurs between transparent materials of different densities. See more. Also, a higher refractive index can deal with higher prescription glasses. RI is defined as the ratio of the velocity of light in a vacuum to the velocity of light in a material and is of vital importance in the case of ocular implants. Refractive Index Formula: The value of this constant, $$\frac{\sin \,i}{\sin \,r}$$ for a light ray passing through a vacuum into a given medium is called the refractive index, n of the medium. It is defined as: This relationship is also known as Snellâs law. The refractive index of the lens indicates the efficiency of lens material on bending or refracting light. refractive index The final step in the calculation sequence is to determine the ratio of the sine of the angle of incidence / sine of the angle of refraction. 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