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"high refractive index" is correct and usable in written English.
You can use it to describe the refractive index of a material or surface that is higher than usual. For example, "The transparent plastic material had a high refractive index, making it perfect for use in optics and other applications."
Exact(60)
Their high refractive index is also indicative, but other materials have similar refractivity.
"It's transparent and has a high refractive index.
Also, tungsten oxide has a high refractive index.
Added to glass, thorium yields glasses with a high refractive index, useful for specialized optical applications.
A high refractive index at the LED-air interface means the light is reflected straight back inside.
This broadens the high refractive index limit of transparent optical materials using a physical deposition process.
Thin films of titanium dioxide (TiO2) are important high refractive index coatings in optical multilayer stacks.
Besides, the polarization characteristics and broad incident angles robustness for the high refractive index are demonstrated.
A rather high refractive index in the visible region was found with spectroscopic ellipsometry.
The cured nanocomposites with 30 wt% nanoparticles show high refractive index and good transparency.
Achromaticity of this type of rhombs implies using high refractive index glasses (n > 1.6).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com