Abstract
We consider an extension of the classical experiment known as `Lloyd's mirror' in which an interference pattern is formed by the superposition of light coming directly from a point source with that coming from the specularly reflected image of the same source in a mirror. In the present experiment the mirror is replaced by a planar stratified medium, whose refractive index monotonically decreases away from the surface. This produces a mirage-like reflection. The interference is then the superposition of light coming directly from the source with that from its mirage-like image. An approximate treatment of the positions of the resultant interference fringes is given and a simple experimental demonstration is described.