This principle is actually something you have seen or experienced often, but just don’t realize. These effects were explained in 1816 by French physicist Augustin-Jean Fresnel. Diffraction effects are the deviations from rectilinear propagation that occurs when light encounters edges, screens and apertures. He could not, however, explain what is commonly known as diffraction effects. He was able to come up with an explanation of the linear and spherical wave propagation, and derive the laws of reflection and refraction (covered in previous atoms ) using this principle. shows secondary waves traveling forward from their point of origin. The sum of the secondary waves (waves that are a result of the disturbance) determines the form of the new wave. In 1678, he proposed that every point that a luminous disturbance touches becomes itself a source of a spherical wave. BackgroundĬhristiaan Huygens was a Dutch scientist who developed a useful technique for determining how and where waves propagate. The new wavefront is a line tangent to all of the wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets.
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