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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. Consider following statements i) Snall's slaw valid for these mater ials ii) Snell's slaw is not valid for these mater ials iii) Speed of light in these mater ial is v = (c)/(|n|) iv) Speed of light in these material is v = c |
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Answer» I, iii are CORRECT `-MU SIN THETA R = sin theta i` |
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