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.
The eye behaves differently in high or low light conditions: in daylight, for brightness levels above 3 cd/m 2 the vision is mainly done by the centre of the retina, we can see colors and the maximum sensitivity is at 555 nm (in the green region). This type of vision is called photopic vision. In low light conditions, for brightness levels below 30 Î¼cd/m 2, the vision is mainly done by the peripheral region of the retina which is color-blind, while the centre region is not sensitive enough to see any color. This type of vision is called scotopic vision.