Fresnel ShaderBasic Shader
Although the Fresnel shader can be used in any material channel (preferred is the Reflection channel), it does not affect the bump or displacement channels unless used as a secondary channel within Fusion or something similar.
It’s hard to imagine not using a Fresnel shader when rendering glass. This shader can also make numerous types of materials look more realistic. Because the greater the angle at which you view a surface, the more reflective any surface becomes.