Abstract: The negative refractive material is receiving much attention recently because of its many peculiar features, especially the anomalous refraction, compared with the regular material. A detailed explanation of the anomalous refraction in material with a negative refractive index using the Huygens principle is presented. The differences of the design of optical devices of the negative refractive material and that of regular material are also analyzed.

Key words: negative refractive index material, anomalous refraction, Huygens principle