Earwigs eat aphids and several other harmful pests as well as hosta leaves. Some gardeners put up with the damage and leave the earwigs in the garden to control other pests. You can control earwigs with traps. Place a piece of crumpled paper under a flowerpot or use a tube of paper or bamboo as a trap.
In optics, refraction is a phenomenon that often occurs when waves travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media, the wave's phase velocity is altered, usually causing a change in direction.
Noun. 1. refraction-the change in direction of a propagating wave (light or sound) when passing from one medium to another. physical phenomenon-a natural phenomenon involving the physical properties of matter and energy. birefringence, double refraction-splitting a ray into two parallel rays polarized perpendicularly.. the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different. 2. a. the ability of the eye to refract light that enters it so as to form an image on the retina. b. the determining of the refractive condition of the eye.