White light fringes in a <a href="https://en.wikipedia.org/wiki/Michelson_interferometer" class="extiw" title="en:Michelson interferometer">Michelson interferometer</a>. 
A Michelson interferometer using white light. (a) Michelson interferometer with a mirror beam splitter. A compensator plate is required to equalize the two paths. The two beams differ in the number of phase inversions. The central fringe representing equal path length is dark. (b) Michelson interferometer with a cube beam splitter, which provides equal phase shifts for the longitudinal and transverse beams. The central fringe representing equal path length is bright.
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This is a montage of (a) My own work, created with Inkscape and exported to PNG because of a librsvg bug, (b) <a href="https://en.wikipedia.org/wiki/File:Wei%C3%9Flichtinterferogramm.jpg" class="extiw" title="en:File:Weißlichtinterferogramm.jpg">File:Weißlichtinterferogramm.jpg</a> uploaded by de:User:Membeth as a public domain image (c) a computer simulation of a white light interferogram that I generated.