1 You have signs of infection, such as: 2  Increased pain, swelling, warmth, or redness around the bite. 3  Red streaks leading from the bite. 4  Pus draining from the bite.  A fever.
A negative index of refraction due to three-dimensional chirality is demonstrated for abilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which alsoshows negative electric and magnetic responses and exceptionally strong optical activity and circular dichro-ism.
If you take a big piece of glass â and pass light through it it will only take one path. In isotropic condition the refractive index of light is independent of polarisation and direction. But you can guess from the name âdouble refraction how it is different. The real cause of double refraction is anisotropy. Light experiences different refractive index along different directions. Note that rays along along principal axis (optic axis ) there is no such behaviour.