it changes in velocity
speed
speed
The speed of light and its wavelength decreases when it enters a new medium. The physicist Snell showed that it can vary.
The speed at which a wave passes through water or other medium is called phase velocity.
Sound is a wave (of energy) in a medium [solid,liquid, or gas] (a compression wave in fact), therefore it is refracted by any change in the medium AND by the fact that it is never coherent (it never travels in only a straight line).
It changes direction, according to Snell's Law.
speed
When light passes from one medium to another with a different refractive index, andnot in a direction perpendicular to the boundary between the media, its speed changes.
speed
the speed of light, commonly denoted as "c", is constant no matter which medium it passes through.
When light traveling at an angle passes from one material into another, it undergoes refraction. Refraction is the bending of light as it passes from one medium to another, due to the change in the speed of light. The degree to which the light bends depends on the angle of incidence and the refractive indices of the materials involved.
The speed decreases.
The speed of light and its wavelength decreases when it enters a new medium. The physicist Snell showed that it can vary.
The speed at which a wave passes through water or other medium is called phase velocity.
Sound is a wave (of energy) in a medium [solid,liquid, or gas] (a compression wave in fact), therefore it is refracted by any change in the medium AND by the fact that it is never coherent (it never travels in only a straight line).
The speed of light depends on the electrical characteristics of whatever medium it happens to be in at that instant. It has one speed in vacuum, another speed in air, another in glass, another in water, and yet another speed in jello. When passing from a more-optically-dense medium to one where its speed is higher, it doesn't need a stomp on the gas to 'accelerate' to the higher speed.
Refraction of light takes place where a beam of light passes from one medium to another and the speed of light in those two media is different.