Nov 10, 2019 huygens principle and reflectionrefraction the laws of reflection and refraction can both be derived from huygens principle. Principe dhuygensfresnel en 1678, huygens a fait lhypothese suivante. Contemporary view r distance from source s to point o on wavefront at aperture. Huygens principle it states that each point of the wavefront is the source of the secondary wavelets which spread out in all direction with the speed of a wave. Latinautor acodem, abramus digital, modernworkspub, emi music publishing, latinautor warner chappell, bmi broadcast. Direction from points o to points p is not constant, so amplitude of wavelets originat. The fresnel equations or fresnel coefficients describe the reflection and transmission of light or electromagnetic radiation in general when incident on an interface between different optical media. So if we consider a point source, it will emit its wavefront and nature of the wavefront will be spherical one. Construction of wavefronts isotropic materials the figures present three cases for different the index of refraction of medium2.