Before revision: As a result, the new wavefront is formed by the superposition of these wavelets.alt=Huygens principle of double refraction|Huygens ’ principle of double refraction.|248x248px History Double refraction in calcite.
After revision: As a result, the new wavefront is formed by the superposition of these wavelets.alt=Huygens principle of double refraction|Huygens ' principle of double refraction.|248x248px History Double refraction in calcite.