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In 1834, Lloyd devised an interesting method of producing interference, using a single mirror, and using almost grazing incidence. The Lloyd’s mirror consists of a plane mirror about 30 cm in, length and 6 to 8 cm in breadth (see Fig. 14.20). It is polished on the front surface and blackened at, the back to avoid multiple reflections. A cylindrical wavefront coming from a narrow slit S, falls on, the mirror which reflects a portion of the incident wavefront, giving rise to a virtual image of the slit, , white bu, ideration of the, ange leads 10 @ pat

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Fresnel’s double mirror is an arrangement for obtaining two coherent sources by using the, phenomenon of reflection, It consists of two plane mirrors inclined to each other at a very smal