An optical microscope is an instrument used to visualize objects too small to be seen with the unaided human eye. It functions by employing a system of lenses and light sources to achieve magnification and resolution, allowing scientists to observe minute details of biological and material samples. Different types of illumination techniques, such as transmitted or reflected light, allow for the examination of various specimen types, ranging from cellular structures to crystal lattices. The technology has been fundamental to advancements in biology and medicine, enabling the study of morphology and the identification of microscopic life forms.