A very simple one of these devices can be constructed from two pieces of glass separated by a thin "air wedge.
A very simple one of these devices can be constructed from two pieces of glass separated by a thin "air wedge." A compensator plate can be used to correct for phase differences in these devices. On September 14, 2015, two of these devices located in Hanford, Washington, and Livingston, Louisiana, detected radiation emitted by a black hole merger. In the most common type of these devices, a coherent and monochromatic beam is split into two and (*) recombined after the two beams are sent down two "arms" oriented perpendicular to each other. LIGO uses a type of this device, which was used in an experiment to disprove the existence of the luminiferous ether. "Fringes" due to superposition of waves can be observed with, for 10 points, the Michelson form of what devices?
A very simple one of these devices can be constructed from two pieces of glass separated by a thin "air wedge.
interferometers [accept more specific answers like "Michelson interferometers"]