You're asking for the refractive index of germanium and Pyrex, not refraction. Refraction refers to the bending of light as it passes from one medium to another, while the refractive index is a property of the material that quantifies how much light bends.

Here are the refractive indices for germanium and Pyrex:

* Germanium: The refractive index of germanium varies slightly depending on the wavelength of light, but it's typically around 4.0 for visible light.

* Pyrex: The refractive index of Pyrex is also dependent on the wavelength, but it's typically around 1.47 for visible light.

It's important to note that these are approximate values. The exact refractive index of a material can vary depending on factors such as temperature, pressure, and the specific composition of the material.