Sekundaaripeiliä

Sekundaaripeiliä refers to a secondary mirror, a component commonly found in reflective telescopes. Its primary function is to redirect the light collected by the main mirror (the primary mirror) towards the eyepiece or a sensor where the image is formed. Without a secondary mirror, the light from the primary mirror would typically converge in front of the telescope's focuser, making it inaccessible for observation.

There are several common designs for secondary mirrors, with the Newtonian telescope featuring a flat, elliptical secondary mirror placed at a 45-degree angle to the incoming light. This redirects the light beam out of the side of the telescope tube. In Cassegrain and Gregorian telescopes, the secondary mirror is convex and is placed in the path of the converging light from the primary mirror. This design reflects the light back through a hole in the center of the primary mirror. The shape and placement of the secondary mirror are crucial for the overall optical performance and image quality of the telescope. They are typically made of highly reflective materials and must be precisely aligned to avoid aberrations.