Rasagar/Library/PackageCache/com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-properties/transparency-inputs/index-of-refraction.md

Index of Refraction

The index of refraction for this material. The index of refraction defines the ratio between the speed of light in a vacuum and the speed of light in the medium of the material. Higher values produce more intense refraction.
This property only appears when you select Box, Sphere or Thin from the Refraction Model drop-down.