Typically, the human eye focuses incoming light on the correct spot of. We may expect (and will prove in the next section) that due to the randomness of molecule positions, the waves scattered by individual molecules may be treated as incoherent ones, so that the total scattering power may be calculated just as the sum of those scattered by each molecule. One of the common applications of refraction of light waves is in the use of eyeglasses. For example, sound waves are known to refract when traveling over water. diffraction, the spreading of waves around obstacles. Now let us explore the effect of such Rayleigh scattering on wave propagation in a gas, with a relatively low volumic density \(\ n\). A direct result of Huygens’ wavelets is the property of diffraction, the capacity of sound waves to bend around corners and to spread out after passing through a small hole or slit.
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