Respuesta :
Yes, wavelets, which stop light waves from propagating, are not present at every point on a wavefront.
What causes the parallelism of the light waves in laser light?
Laser light has non-parallel waves. Theoretically, unless you have an endlessly wide beam, it is impossible to build a beam with exactly parallel rays. Even a completely spatially coherent beam will spread out due to diffraction, as stated in the textbook "Principles of Lasers" by Orazio Svelto. All waves, including those of sound, water, radio, and light, bend around curves due to diffraction. Additionally, more than simply the wave's edge bends around the corner. The full wave is it. A beam's divergence is simply how far its rays are spreading out. The width of the beam and the wave length both affect how widely they disperse. A laser's narrower beam disperses more quickly than its larger beam.
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