Objective Lens / Microscope Objective Lens

The objective lens of a microscope is the lens that is the closest to the sample. The objective lens is used in every lab that uses microscopes, including forensics, clinical diagnostics, environmental, and life science laboratories. The job of the objective lens is to gather the light from the sample and magnify it. To get the highest magnification, one should use specialized objective lenses that are oil-immersion or water-immersion lenses which need oil or water, respectively to fill the space between the lens and the sample. With a regular objective lens air fills that space. Some features that vary among objective lenses are their magnification power, their focal length, and whether or not they are oil or water immersion lenses.