Optical devices are instruments that utilize light to enhance human vision or capture images. Common examples include cameras, telescopes, and microscopes, each serving unique purposes in various fields such as photography, astronomy, and biology. These devices work on principles of optics, manipulating light through lenses and mirrors to produce clear images. They play a crucial role in scientific research, medical diagnostics, and everyday life, enabling us to explore the universe, examine tiny organisms, and capture moments in time.