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The speed at which a specific phase of a light wave (e.g., a crest or trough) travels through a given medium. In a vacuum, this is the speed of light ($c$, approximately $299,792,458 ext{ m/s}$).
read more about wave velocity ...The wave velocity of light decreases when it passes from a vacuum into a denser medium (like glass, air, or the eye's aqueous humor). This slowing down is what causes refraction (bending of light).
Wave velocity ($v$) is determined by the speed of light in a vacuum ($c$) divided by the refractive index ($n$) of the medium: $v = c / n$.
For electromagnetic waves, velocity equals the frequency ($f$) multiplied by the wavelength ($\lambda$): $v = f\lambda$.
Yes. Light slows down significantly as it enters the cornea and lens, which have a refractive index greater than $1.0$ (air).
The speed of light is constant only in a vacuum. It varies depending on the medium it travels through.
The velocity at which the energy or information carried by the wave travels, which can sometimes be slightly different from the phase velocity in dispersive media.