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"refractive index" is a correct and usable term in written English.
It refers to the measurement of the degree to which a material refracts (bends) a ray of light. For example, "The refractive index of glass is 1.5, which is why a glass lens can focus light."
Dictionary
refractive index
noun
The ratio of the speed of light in air or vacuum to that in another medium.
synonyms
Exact(60)
Its refractive index u is unknown.
spectroscopy and refractive index measurements.
Zhang, S. et al. Negative refractive index in chiral metamaterials.
So the light itself changes the refractive index.
"It's transparent and has a high refractive index.
Here, the refractive index is assumed to 1.45.
where n1 = 1 is the refractive index of air and n3 is the refractive index of the fused silica.
Natural materials, such as water, have a positive refractive index.
The refractive index depends on the response of a material to electric and magnetic fields.
Diamonds have a refractive index of 2.4, giving them their sparkling beauty.
We show the calculated critical angle as a function of the refractive index of the scintillator in Fig. 1(B) for air (refractive index: 1) and a typical example of glass (refractive index: 1.5).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com