ECOPTIK - Plano Concave Lens Dec.11 ...
A plano concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length, and can be used for light projection, beam expansion, or to increase focal length ...
US researchers have focused a plane microwave by a plano-concave lens fabricated from a photonic crystal specially designed to have negative refractive index and left-handed electro-magnetic ...
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