Definition of null lens

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PI Physik Instrumente - Microscope Stages LB ROS 11/24

Photonics Dictionary

null lens: A lens used in the optical testing of an aspheric surface. It converts a spherical wavefront into one that precisely matches the surface under test. When the wavefront is reflected from that surface, it reverses its path and, if the surface is perfect, results in a perfect emerging spherical wavefront, which is easily evaluated.

Ohara Corp. - Optical Glass, Polish substrates 10-23

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