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The optical properties of a medium are governed by the relative permitivity (epsilon_(r)) and relative permeability (mu_(r)). The refractive index is defined as sqrt(mu_(1)epsilon_(r))=n . For ordinary sing is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with epsilon_(r)lt0 and mu_(r)lt0 . Since then such 'meta materials' have been produced in the laboratorised and their optical properties studied. For such materials n = -sqrt(mu_(r)epsilon_(r)). As light entes a medium of such refractive index the phases traval away front the direction ofpropagation.For light incident from air on the meta materials, then appropriate ray diagram is |
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Answer»
`-MU SIN theta R = sin theta i` |
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