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Objective: The first lens or curved mirror that collects and focuses the incoming light. Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror.
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 ...
To create the primary mirror Newton used a custom composition of metal consisting of six parts copper to two parts tin, an early composition of speculum metal. [4] He devised means for shaping and grinding the mirror and may have been the first to use a pitch lap [ 7 ] to polish the optical surface.
Cannibalization of machine parts, in the maintenance of mechanical or electronic systems with interchangeable parts, refers to the practice of removing parts or subsystems necessary for repair from another similar device, rather than from inventory, usually when resources become limited. The source system is usually crippled as a result ...
A side-view mirror (or side mirror), also known as a door mirror and often (in the UK) called a wing mirror, is a mirror placed on the exterior of motor vehicles for the purposes of helping the driver see areas behind and to the sides of the vehicle, outside the driver's peripheral vision (in the "blind spot").
A mouth mirror or dentist's mirror is an instrument used in dentistry. The head of the mirror is usually round, and the most common sizes used are No. 4 (⌀ 18 mm) and No. 5 (⌀ 20 mm). [1] A No. 2 is sometimes used when a smaller mirror is needed, such as when working on back teeth with a dental dam in place. The mouth mirror has a wide ...
The committee favorably reported his nomination to the Senate floor on August 4, 2021. Knapper was confirmed by the Senate by voice vote on December 18, 2021. [5] He was sworn into office on January 3, 2022. [6] Knapper arrived to Vietnam on January 27, 2022 [7] and presented his credentials to president Nguyễn Xuân Phúc on February 11. [8]
Richard Franklin Mirer (born March 19, 1970) is an American former professional football player who was a quarterback for 12 seasons in the National Football League (NFL). He played college football for the Notre Dame Fighting Irish and was selected by the Seattle Seahawks with the second overall pick of the 1993 NFL draft. [1]