A semi-circular glass slab with dimensions 90x45x10 mm and a D-shaped profile is a unique and specialized piece of glass material. Let’s break down the description:

Shape: The glass slab has a semi-circular shape, meaning it resembles half of a complete circle. The curved edge of the glass slab follows the curvature of a circle, while the other edge is straight.
Profile: The slab has a D-shaped profile. In this case, the straight edge of the semi-circular slab has been further shaped to create a flat side, resembling the shape of the letter “D.” This flat side can be used for specific purposes, such as mounting or attaching the glass slab to other surfaces.
Material: The material is glass, which implies transparency and potentially optical properties.
Potential Uses:

Optical Applications: Due to its shape and potential transparency, the glass slab could be used in optics experiments, lens systems, or other optical devices.
Decorative Element: The unique D-shaped profile could make this glass slab suitable for artistic or decorative purposes.
Scientific Experiments: In a laboratory setting, this glass slab might be utilized for refractive index experiments or other studies involving light propagation through different mediums.