Objektiivinpeili

Objektiivinpeili, also known as an objective mirror or simply objective, is a crucial optical component in reflective telescopes and microscopes. It is the primary mirror that collects light from a distant object and focuses it to a point. The quality and shape of the objektiivinpeili directly determine the telescope's or microscope's light-gathering ability and resolution.

In reflecting telescopes, the objektiivinpeili is typically a concave mirror, shaped like a paraboloid, ellipsoid, or sphere. This specific curvature is designed to converge parallel light rays from celestial objects to a focal point. The larger the diameter of the objektiivinpeili, the more light it can collect, allowing for the observation of fainter and more distant objects. Different types of reflective telescope designs, such as Newtonian, Cassegrain, and Schmidt-Cassegrain, utilize various configurations and types of objektiivinpeili.

In microscopy, the objektiivinpeili is the lens closest to the specimen. It is responsible for gathering light that passes through or reflects off the specimen and forming the initial magnified image. The numerical aperture (NA) of the objektiivinpeili is a key parameter, indicating its ability to capture light rays at wide angles, which in turn affects the resolution and depth of field. High-power microscopes often use oil immersion objectives, where a drop of immersion oil is placed between the specimen and the objektiivinpeili to increase the NA and thus the resolution. The manufacturing process for an objektiivinpeili involves precise grinding, polishing, and coating to achieve the required optical properties.