Before JWST began science operations, a dust-sized particle struck one segment of its 6.5-metre mirror at hypervelocity and left an uncorrectable deformation — damage revealed because Webb can detect nanometre-scale changes in its own optical surface. - Space Daily
Source:Space Daily
Webb detected a permanent deformation on mirror segment C3 through nanometre-scale wavefront sensing, corrected part of it and remained well inside requirements.
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