How much is the refractive index of heat in radiation in glass?

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Alan Robinson

@Satish Narula. By "refractive index of heat", do you mean the refractive index of glass at infra-red wavelengths?

What glass composition? What IR wavelengths are you interested in?

A good place to look is http://refractiveindex.info/

For example, for silica glass at wavelengths between 0.21 and 6.7 μm

https://refractiveindex.info/?shelf=glass&book=fused_silica&page=Malitson

Derived from Malitson https://www.osapublishing.org/josa/abstract.cfm?uri=josa-55-10-1205 Article Interspecimen Comparison of the Refractive Index of Fused Silica

and Tan

Article Determination of refractive index of silica glass for infrar...

You can select other materials from the "shelf", "book" and "page" menus

BK7 Optical glass: https://refractiveindex.info/?shelf=glass&book=BK7&page=SCHOTT

Schott Infra-Red Glass https://refractiveindex.info/?shelf=glass&book=SCHOTT-IRG&page=IRG22

Talib Abidzaid Alsharify

check the encyclopedia