Andy Resnick said:
Waves are a form of energy that require a medium to travel through. This medium can be solid, liquid, or gas. When a wave encounters a boundary between two mediums, it will either be reflected, absorbed, or refracted. It cannot exist in both mediums simultaneously because it needs a physical medium to propagate.
When a wave encounters a boundary between two mediums, it will either be reflected, absorbed, or refracted. Reflection occurs when the wave bounces off the boundary and remains in the same medium. Absorption occurs when the wave's energy is absorbed by the second medium. Refraction occurs when the wave changes direction as it enters the second medium.
No, light waves cannot exist in two mediums at the same time. Light is a type of electromagnetic wave, and like all waves, it requires a medium to travel through. Light can travel through air, water, and other materials, but it cannot be in two mediums simultaneously.
When light waves encounter a boundary between two mediums, they will either be reflected, absorbed, or refracted. The amount of reflection, absorption, and refraction depends on the properties of the two mediums and the angle at which the light hits the boundary.
In some cases, it may appear that a wave is in two mediums at the same time. For example, when light travels from air to glass, it is partially reflected and partially refracted. The refracted light travels through the glass, but some of it also travels along the surface of the glass, making it seem like the light is in two mediums at the same time. However, the light is still only in one medium at any given point in time.