The optical microscope has been a standard tool in life science as well as material science for more than one and a half centuries now.
The optical microscope, often referred to as the “light microscope”, is a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope. Historically optical microscopes were easy to develop and are popular because they use visible light so that samples may be directly observed by eye.
The image from an optical microscope can be captured by normal light-sensitive cameras to generate a micrograph. Originally images were captured by photographic film but modern developments in CMOS and charge-coupled device (CCD) cameras allow the capture of digital images.