https://www.khanacademy.org/science/optics-essentials/x0484cce4552ac2a3:why-do-bubbles-appear-colorful/x0484cce4552ac2a3:why-does-light-bend-around-corners/v/huygen-s-theory-of-light-wavefronts 2020-12-01T07:36:01Z Huygen's theory of light & wavefronts Huygen's proposed that light is a longitudinal wave in the aether medium - a medium that pervades the entire universe. The set of particles oscillating in phase with each other is called a wavefront. Point sources give out spherical wavefronts, while sources at infinity give plane wavefronts. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Huygen's theory of light & wavefronts Huygen's proposed that light is a longitudinal wave in the aether medium - a medium that pervades the entire universe. The set of particles oscillating in phase with each other is called a wavefront. Point sources give out spherical wavefronts, while sources at infinity give plane wavefronts. https://cdn.kastatic.org/ka-youtube-converted/FpTFU4Yh7gQ.mp4/FpTFU4Yh7gQ.mp4 528 Wave optics https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/standing-waves/v/constructive-and-destructive-interference 2024-06-22T14:02:12.128804105Z Constructive and destructive interference Constructive interference happens when two waves overlap in such a way that they combine to create a larger wave. Destructive interference happens when two waves overlap in such a way that they cancel each other out. Wave interference also depends on the relative phase of the two waves, as this video shows through the examples of path length differences and pi shifts. David SantoPietro video https://cdn.kastatic.org/googleusercontent/ue4DKoFZ-8dXABMTqjtB4zoDqrJjz8ne2iT-ixFxxOQxJ2yWZzL14aFjytl-LCVedBbqmxh1xTcQ8dEnBvHjUMeDuw Constructive and destructive interference Constructive interference happens when two waves overlap in such a way that they combine to create a larger wave. Destructive interference happens when two waves overlap in such a way that they cancel each other out. Wave interference also depends on the relative phase of the two waves, as this video shows through the examples of path length differences and pi shifts. https://cdn.kastatic.org/ka-youtube-converted/oTjTXS40pqs.mp4/oTjTXS40pqs.mp4 824 Wave optics https://www.khanacademy.org/science/optics-essentials/x0484cce4552ac2a3:why-do-bubbles-appear-colorful/x0484cce4552ac2a3:untitled-116/v/worked-example-diffraction-slit-width 2023-04-26T21:01:18.499030148Z Worked Example: Diffraction slit width Let's solve some questions on the diffraction slit width Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked Example: Diffraction slit width Let's solve some questions on the diffraction slit width https://cdn.kastatic.org/ka-youtube-converted/I9xEs2FLO1s.mp4/I9xEs2FLO1s.mp4 380 Wave optics https://www.khanacademy.org/science/jnv-board-preparation-class-12-physics/x194606e36b639209:week-2/x194606e36b639209:wave-optics/e/wave-optics 2026-04-07T23:17:37.123726494Z Wave optics Let's practice! vibhor exercise