A simple microscope is an optical device that uses a single convex lens to magnify small objects for detailed observation. It works by bending light rays to produce an enlarged, upright image of the specimen. Commonly used in biology, laboratories, and educational settings, it helps in examining microorganisms, plant cells, and tiny structures. Unlike compound microscopes, it has a lower magnification power but is easy to use and portable. Simple microscopes are widely used in jewelers' loupes, watchmaking, and scientific studies, making them an essential tool for basic magnification needs.