In microscopy, what is the function of the objective lens?

The role of the objective lens in microscopy is primarily to magnify the specimen. This lens is positioned closest to the slide being observed and is responsible for the initial magnification of the specimen's image. Different objective lenses offer varying levels of magnification, allowing the user to choose the appropriate level based on the detail required in the observation.

While the illumination of the specimen is important, it is the function of the light source, which is separate from the objective lens itself. Focusing on the ocular lens and reducing glare, while relevant to the overall observation process, are secondary functions that do not define the core purpose of the objective lens. Thus, the primary and correct function of the objective lens is to enhance the visibility of the specimen through magnification.