What is high low objective in a microscope?

In microscopy, the high-low objective refers to the use of multiple objective lenses with varying magnifications, typically a high-power lens (e.g., 40x or 100x) and a low-power lens (e.g., 10x or 20x). The low-power objective is used for scanning and locating areas of interest on a specimen, while the high-power objective allows for detailed observation of specific structures. This combination enables efficient examination and detailed analysis of samples in biological and material sciences.