What is the purpose of a cover slip in microscopy?

The purpose of a cover slip in microscopy is to cover a specimen on a microscope slide. This transparent piece of glass or plastic serves several key functions. First, it creates a flat and even surface over the sample, which is essential for obtaining a clear and focused view under the microscope. This is particularly important when observing thin specimens or slides containing liquid samples, as it prevents the specimen from drying out and helps maintain the integrity of the sample during observation.

Additionally, the cover slip helps to protect both the specimen and the microscope's objective lenses from contamination and damage, especially when using high magnifications. It also minimizes the amount of light refraction, allowing for better visualization. While the cover slip does not directly magnify the specimen or hold it in place, its role in supporting a clear and consistent field of view is crucial for effective microscopy.