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10 cards from this deck
Imaginary line connecting points in phase on a wave
Wave generator so small it's treated as single point
Waves travel equally in all directions
At exactly same stage of wave cycle
Christiaan Huygens
Each wavefront point acts as source of spherical secondary waves
Circular waves from each point on wavefront
Draw tangent to all secondary wavelets
Waves bending around corners
Waves change speed & direction in different materials
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