autocollimation
/ˌɔːtə(ʊ)ˌkɒlɪˈmeɪʃn/noun
The procedure of passing a beam of light though a converging lens on to a plane surface that reflects it back the way it has come (initially as a parallel beam); the use of an autocollimator; an instance of this.
- The procedure is used for purposes such as ascertaining the angle of a reflecting surface and measuring the alignment of machine parts..
Origin
Late 19th century; earliest use found in Nature: a weekly journal of science. From French autocollimation from auto- + collimation.
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