Huygens-Fresnel principle: https://en.wikipedia.org/wiki/Huygens%E2%80%93Fresnel_principle https://en.wikipedia.org/wiki/Huygens%E2%80%93Fresnel_princi... Para

Huygens-Fresnel principle: https://en.wikipedia.org/wiki/Huygens%E2%80%93Fresnel_principle https://en.wikipedia.org/wiki/Huygens%E2%80%93Fresnel_princi... Parallel axis theorem: https://en.wikipedia.org/wiki/Parallel_axis_theorem https://en.wikipedia.org/wiki/Parallel_axis_theorem