immortal Posted May 17, 2007 Share Posted May 17, 2007 I asked my physics teacher whether refractive index can be negative and he said that it can't be. But a group of scientist have made a meta material which has a negative R.I and it has made possible to make perfect lens which can focus at an area less than wavelenght of light. Do the laws in physics change often for example General relativity says it is imposible to travel faster than the speed of light but according to quantum mechanics it is possible for a photon to travel faster than the speed of light. LINK:- http://www.physicstoday.org/vol-57/iss-6/p37.html Link to comment Share on other sites More sharing options...
BhavinB Posted May 17, 2007 Share Posted May 17, 2007 A meta-material isn't a 'material'...its more a well ordered and shaped collection of materials (metals and dielectrics) such that the total contribution forces a negative refractive index. There is no natural material with negative refractive index. Link to comment Share on other sites More sharing options...
Klaynos Posted May 17, 2007 Share Posted May 17, 2007 Also negative refractive index materials do not break any physical laws, nor do they need any changed. They are found by application of Maxwell's equations. Link to comment Share on other sites More sharing options...
samsingh Posted May 20, 2007 Share Posted May 20, 2007 i think ri can be negative Link to comment Share on other sites More sharing options...
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