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PGC 1470080 is a type E [1] elliptical galaxy located in the Boötes constellation. [2] It is located 3 billion light-years away from the Solar System and has a diameter of 571,000 light-years, [ 3 ] making it a type-cD galaxy and one of the largest .
Dall-Kirkham reflecting telescope, built by Horace Edward Dall. The Modified Dall-Kirkham telescope utilizes an elliptical primary and spherical secondary mirror as in the conventional Dall-Kirkham configuration, but also includes a lens group (usually two or three lens elements) ahead of the focal point to improve off-axis image quality.
The needed amount of toroidal shape can be transferred entirely or partially to the primary mirror. In large focal ratios optical assemblies, both primary and secondary mirror can be left spherical and a spectacle correcting lens is added between the secondary mirror and the focal plane (catadioptric Yolo).
Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.
A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...
The vast, flat expanse creates a stunning mirror effect after rainfall, reflecting the sky and surrounding landscape, making it a popular natural wonder. Image credits: Christopher Crouzet #14 ...