2010•Optical EngineeringRequires access

Measuring the effective focal length and the wavefront aberrations of a lens system

Didia Patricia Salas-Peimbert

Abstract

A new, simple method to measure the effective focal length of a thick lens or lens system in the laboratory when a lens nodal bench is not readily available is described. Use is made of the Talbot autoimaging effect by placing the lens in a collimated light beam, with a Ronchi ruling in front of the lens and another in the refracted beam.

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Available abstract

Key concepts: Optics, Lens (geology), Wavefront, Collimated light, Focal length, Simple lens, Cardinal point, Beam (structure)