An optical device is a tool that manipulates light to enhance vision or create images. Common examples include lenses, microscopes, and cameras. These devices work by bending, reflecting, or refracting light to focus it in a way that allows us to see objects more clearly or magnify them for detailed observation. Optical devices are essential in various fields, including medicine, photography, and astronomy. In medicine, endoscopes help doctors view internal organs, while in astronomy, telescopes allow scientists to observe distant celestial bodies. Overall, optical devices play a crucial role in expanding our understanding of the world around us.