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

secondary mirror
subject			fact

secondary mirror	has definition 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.
	is a kind of mirror
mirror	has reflective coating
	has wavefront modification shape
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

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