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Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. For example, waves in deep water travel faster than in shallow.

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Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflectionof light, sound and water waves.

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It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. In classicalphysics, the diffraction phenomenon is described as the interference of waves according to the Huygens–Fresnel principle.

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the middle quality or state between two extremes; a reasonable balance.

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a wave vibrating at right angles to the direction of its propagation.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

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an oscillation of the parts of a fluid or an elastic solid whose equilibrium has been disturbed, or of an electromagnetic wave.

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moving in one side and out of the other side of (an opening, channel, or location).

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rise to its highest level.