For example, H-Cl has a dipole. The electrons spend more of their time near the Cl atom (the red end in the diagram below). A dipole-dipole interaction is the attraction between two polar molecules. When they approach each other, the negative end one molecule attracts the positive end of the other.
Eyes sensitive to light can also be caused by viruses or inflammation, such as those found in sinus infections. If you have a cough, aching jaw, blocked nose, headaches and lethargy then it's best to visit your GP for a diagnosis of a possible sinus infection and simple antibiotic treatment.
Vision and color perception. 1  Human eyes have a light-sensitive layer--the retina--which carries two types of light-sensitive cells: rods and cones. Rods are sensitive to dim light (scotopic vision) but do not provide color information. 2  For greatest acuity look straight; for greatest sensitivity, look to the side.