coherent: Of waves having the same direction, wavelength and phase, as light in a laser.In other words, the wave undergoes a 180 degree change of phase upon reflection, and the reflected ray “jumps” ahead by half a wavelength. When light is reflected off a medium with a higher index of refraction, crests get reflected as troughs and troughs get reflected as crests.When light goes from a vacuum to some medium, like water, its speed and wavelength change, but its frequency f remains the same. Light exhibits wave characteristics in various media as well as in a vacuum.When two or more waves are incident on the same point, the total displacement at that point is equal to the vector sum of the displacements of the individual waves.
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