If you dip your finger into water with a constant frequency, the resulting sketch would be a series of concentric circles, called wave fronts, centered on your finger. A wave front is a line that represents the crest of a wave in two dimensions, and it can be used to show waves of any shape, including circular waves and straight waves. Wave fronts drawn to scale show the wavelengths of the waves, but not their amplitudes.
Whatever their shape, two-dimensional waves always travel in a direction that is perpendicular to their wave fronts The direction can be represented by a ray, which is a line drawn at a right angle to the crest of the wave.
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