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

achromatic lens
subject			fact

achromatic lens	has definition Lens (or combination of lenses) that brings different wavelenghts within a ray of light to a single focus, thus overcoming chromatic aberration. It was first successfully made by Joseph von Fraunhofer.
	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

Kinds of achromatic lens :

• achromatic objective (2 facts) - A lens of two or more components with different refraction indices (e.g., crown glass and flint glass), used to correct for chromatic aberration.

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