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First-surface mirrors are now made for applications requiring a strict reflection without a ghosting effect as seen with a second-surface mirror, where a faint secondary reflection could be observed, coming from the front surface of the glass. This includes most optics applications where light is being manipulated in a specific manner.
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 ...
New Aranmula Kannadi Aranmula kannadi Aranmula kannadi in its raw, unpolished form Aranmula kannadi in various etched brass frames on display. Aranmula Kannadi, meaning the Aranmula mirror, is a handmade, metal-alloy, first surface mirror made in Aranmula, a small town in Pathanamthitta in the state of Kerala, India.
The primary mirror in most modern telescopes is composed of a solid glass cylinder whose front surface has been ground to a spherical or parabolic shape. A thin layer of aluminum is vacuum deposited onto the mirror, forming a highly reflective first surface mirror. Some telescopes use primary mirrors which are made differently.
When glass mirrors first gained widespread usage in Europe during the 16th century, most were silvered with an amalgam of tin and mercury, [6] In 1835 German chemist Justus von Liebig developed a process for depositing silver on the rear surface of a piece of glass; this technique gained wide acceptance after Liebig improved it in 1856.
On July 15, the resulting Wisconsin HTS Axisymmetric Mirror (WHAM) achieved first plasma, a major milestone for the device, and now the team will work on improving efficiencies and hopefully ...
In contrast to household mirrors, where the reflecting metal layer is coated on the back of a glass pane and covered with a protective varnish, precision optical equipment like telescopes needs first surface mirrors that can be ground and polished into complex shapes such as parabolic reflectors. For nearly 200 years speculum metal was the only ...
They are first-surface mirrors, where the immediate bronze surface is flat, plain and highly polished to be reflective, rather than second-surface mirrors, like modern glass mirrors, where the reflection comes from a backing applied to the glass. Maid holding folding mirror for her mistress, Greece, c. 100 BCE