An objective lens is a crucial component of optical instruments like microscopes and telescopes. It is the lens closest to the object being observed and is responsible for gathering light and forming an image. The quality and type of the objective lens significantly affect the clarity and detail of the image produced. In microscopes, objective lenses come in various magnifications, allowing users to view specimens at different levels of detail. In telescopes, the objective lens helps to focus light from distant celestial objects, enabling astronomers to study stars and planets. The design and specifications of the objective lens are vital for achieving high-resolution images.