A cover glass, also known as a cover slip, is a thin, transparent square or rectangular piece of glass or plastic used in microscopy. Unlike microslides, which are used to hold specimens, cover glasses are placed on top of the specimen to protect it and facilitate better visualization under a microscope.
Cover glasses come in various sizes, but a common size for square cover glasses is 22mm x 22mm. The dimensions you provided, “cover glass square,” do not specify a particular size, so the size may vary depending on the intended use and microscope slide size.
Cover glasses are typically very thin, ranging from 0.13 to 0.2 millimeters in thickness. They are optically clear and have a high refractive index to minimize distortions and maintain clarity during microscopic observations.
When preparing a microscope slide, a small amount of mounting medium or immersion oil is often applied to the specimen. The cover glass is then carefully placed on top of the specimen, ensuring there are no air bubbles or debris trapped underneath. The cover glass creates a flat surface, allowing the objective lens of the microscope to focus accurately on the specimen.
Cover glasses help protect the specimen from contamination, evaporation, and damage during microscopy. They also provide a stable and even surface for imaging and can be easily removed and replaced if needed.
It’s worth noting that cover glasses can come in different shapes and sizes, including rectangular, circular, or even customized shapes, depending on the specific requirements of the microscopy technique or application.