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.
Diï¬raction Grating Equation with Example Problems1 1 Grating Equation In Figure 1, parallel rays of monochromatic radiation, from a single beam in the form of rays 1 and 2, are incident on a (blazed) diï¬raction grating at an angle Î¸ i relative to the grating normal. These rays are then diï¬racted at an angle âÎ¸ r. We use a negative sign here based on our convention of angle deï¬nition. That is, positive angles are measured to the left of the grating normal, negative angles to the right.