refraction
Refraction, a common physical phenomenon, means that when the object or fluctuations from one medium oblique into another medium caused by the speed change caused by the angle of the shift. "Refraction" is not necessarily equivalent to "refraction of light", so the light (a kind of shear wave) will change the direction of light because of the difference in "refractive index", but the "refraction" phenomenon can not be used to prove that the light is a fluctuation. The most common example is the aiming of a pistol, and when the bullet passes through the water, its angle is offset by refraction. The so-called "inflection", that is, "light refraction", specifically refers to the light from one medium into another medium with different refractive index, or in the same medium in the refractive index of different parts of the operation, due to differences in wave velocity, So that the direction of light to change the phenomenon of operation. For example, when a stick inserted in the water inside, only with the naked eye to see the stick into the water when the bend, which is light into the water inside, resulting in refraction, it brings this effect. ...