When you shine ultraviolet (UV) light on Pyrex glass, the glass will generally transmit most of the UV radiation. Pyrex glass is a type of borosilicate glass known for its excellent thermal resistance and low coefficient of expansion.
UV light is electromagnetic radiation with a shorter wavelength than visible light, ranging from about 10 nanometers to 400 nanometers. Pyrex glass is designed to have good transparency across a broad range of wavelengths, including UV, visible, and infrared light. As a result, when UV light is shone on Pyrex glass, it will pass through the glass with minimal absorption or scattering.
It's worth noting that UV light can have different effects on different materials, and there are specific types of UV light that can cause certain materials to fluoresce or undergo chemical reactions. However, for most standard sources of UV light and typical Pyrex glass, the glass will allow the UV light to pass through it without significant alteration.