= Lloyd's mirror
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<Lloyd's mirror> produces <interference> between light arriving directly from a narrow source and light reflected by a plane mirror, which appears to originate at the source's virtual image. With source distance $h$ from the mirror, the effective source separation is $2h$. A reflection <phase shift> close to $\pi$ reverses the bright/dark condition relative to two equally phased sources. Spatial filtering, suitable <temporal coherence>, and direct/reflected beam overlap remain necessary.
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