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physical object > artifact > device > instrument > optical device > wavefront modifier > lens > field lens

field lens
subject			fact

field lens	has definition A lens placed in or near the focal plane of a telescope to create an image of the primary mirror inside the instrument.
	is a kind of lens
lens	has index of refraction
	has focal length
	has focal ratio
	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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