Monday, December 3, 2018

optics - What causes light to refract?


The common answer to this question is that light refracts because its speed changes in different materials. But this means that the photons has internal attraction between each other. Is that the case? Otherwise is something else like density of different materials the reason why light refracts?


please give a more convincing explanation.


Explanation of refraction



Answer



This gif shows why with Huygens–Fresnel principle: Huygens–Fresnel principle


Source


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