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

tertiary mirror
subject			fact

tertiary mirror	has definition 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.
	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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