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physical object > artifact > device > instrument > optical device > wavefront modifier > mirror

mirror
subject			fact

mirror	has reflective coating
	has wavefront modification shape
	is a kind of wavefront modifier
instrument	has operator
artifact	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of mirror :

• active optics (2 facts) - Controlling the shape of a telescope mirror at a relatively slow rate.
• adaptive optics (2 facts) - Compensating for atmospheric distortions in a wavefront by high-speed changes in the shape of a small, thin mirror.
• Borosilicate
• Cer-Vit
• deformable mirror (2 facts) - A very thin mirror whose shape can be changed by the force applied by many small pistons behind the mirror.
• Fused-quartz
• honeycomb mirror (2 facts) - A construction method for a large mirror in which the back is hollowed-out to leave a ribbed structure that resembles a honeycomb.
• meniscus mirror (2 facts) - A very thin mirror with a high curvature. A method of constructing very large mirrors which assumes from the outset that the mirror is too thin to hold its shape against gravity and will require an active control system.
• primary mirror (2 facts) - The first mirror encountered by incident light in a telescope system.
• Pyrex
• secondary mirror (2 facts) - The second reflecting surface encountered by the light in a telescope. The secondary is usually suspended in the beam and therefore obstructs part of the primary.
• segmented mirror (2 facts) - A large mirror construction technique in which many smaller elements are built and then actively controlled to conform to the shape of the required large mirror.
• tertiary mirror (2 facts) - The third mirror to be encountered by the light in a telescope system. A tertiary mirror is required on alt-az telescopes to direct light to the stationary Nasmyth foci.
• Zerodur

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