Huygens–Fresnel principle

Light moves in waves.

Each part of a wave makes new tiny waves. These tiny waves join together. This helps light move through space. It also helps light bend. Can you see light bend?

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$File:Refraction - Huygens-Fresnel principle.svg$

Refraction - Huygens-Fresnel principle.svg

$File:HuygensRefractionVariableIndex.svg$

HuygensRefractionVariableIndex.svg

$File:Refraction on an aperture - Huygens-Fresnel principle.svg$

Refraction on an aperture -...

Huygens-Fresnel BW.svg

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📚 Content adapted from Wikipedia | Readability: FK 13.9 | Vital Level 5