https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-dispersion-of-light/v/dispersion 2025-11-19T06:00:41.348624484Z Dispersion The index of refraction in a material isn't always the same for every wavelength. This is how prisms split white light into so many colors. David SantoPietro video https://cdn.kastatic.org/googleusercontent/Zk-PqzT4L3GHwrFBQxO4SRkAjsSETWZwEeS_P07hS8KwnSHw-CGb6E9ExpVfOLzaQ5TWkd8aXNRtcwgDx5jXf1C- Dispersion The index of refraction in a material isn't always the same for every wavelength. This is how prisms split white light into so many colors. https://cdn.kastatic.org/ka-youtube-converted/LksVHUrn8CI.mp4/LksVHUrn8CI.mp4 135 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class-10-physics-india-hindi/in-in-the-human-eye-and-the-colourful-world-hindi/dispersion-of-light-hindi/e/dispersion-of-light 2026-04-08T00:16:02.937952483Z Dispersion of light - definition and characteristics Let's practice some problems to understand the phenomenon of dispersion and one of it's basic features. Satrajit exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-dispersion-of-light-in-prism/v/prism-dispersion-of-light 2021-03-23T22:19:12Z Prism & dispersion of light By doing an experiment let's explore what prisms are and what happens to white light as it passes through a prism.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/PqtknjDuX_6FdIvkEJWkNATXZtGmyCnxnoyyPQIBFEGPkgIzLcWviVHGDlUjuhQEyWhDt0w-idOhAKfgWEfjsLIB Prism & dispersion of light By doing an experiment let's explore what prisms are and what happens to white light as it passes through a prism.  https://cdn.kastatic.org/ka-youtube-converted/3d2C-pDkTEg.mp4/3d2C-pDkTEg.mp4 700 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-dispersion-of-light-in-prism/v/newton-prism-experiment 2021-03-23T22:19:10Z Newton's prism experiment Let's explore how Sir Issac Newton experimentally proved that white light is made of all the colours of the rainbow.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/6PBp3vZP9MOAjkYR2MK6oKvzUQNYo6QbManEuuzRKZaS3R3jzdJ6UN-97_aIeWVkSpuaepk7vyhiymAGqXDKWI4 Newton's prism experiment Let's explore how Sir Issac Newton experimentally proved that white light is made of all the colours of the rainbow.  https://cdn.kastatic.org/ka-youtube-converted/Mqy7T0KtXV8.mp4/Mqy7T0KtXV8.mp4 460 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-in-prisms/v/deriving-prism-formula 2020-06-23T07:22:43Z Deriving prism formula What makes the 22 degrees halo, 22 degrees? Let's derive an expression for the angle of minimum deviation. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/P-ZRlrSce36Q8OWOrWEaxUT5qtoUNjZf7-PJPLxPQgYloAQWgKHxaC9O7s60AzEGVvAlDrnKtkU5-llXkgwbr_bk Deriving prism formula What makes the 22 degrees halo, 22 degrees? Let's derive an expression for the angle of minimum deviation. https://cdn.kastatic.org/ka-youtube-converted/vaHzySzFGZk.mp4/vaHzySzFGZk.mp4 894 Dispersion and Scattering of light https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:in-in-the-human-eye-and-colourful-world/x1ac9c643dc8dffee:in-in-dispersion-of-light/v/dispersion-rainbows 2023-11-30T06:20:11.15616023Z Dispersion (& rainbows) Let's explore dispersion and how it helps in creating beautiful rainbows Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Dispersion (& rainbows) Let's explore dispersion and how it helps in creating beautiful rainbows https://cdn.kastatic.org/ka-youtube-converted/fywXvl38Va0.mp4/fywXvl38Va0.mp4 385 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-dispersion-of-light-in-prism/v/formation-of-rainbows-how-far-are-they-physics-khan-academy 2020-06-23T07:22:42Z Formation of rainbows (& how far are they) Rainbows are formed by the dispersion of light & reflection (not total internal reflection) from drops of water. The rainbow color sequence can be analyzed by drawing a ray diagram of the refraction of sunlight inside water drops. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/h3xrfaPRK3nabthKES6eQjh8wNRffbXypYBzu647lpi2Qalw1G2U9rvxyaDFcNO0n1YpQIAjwe7l2QRupxzHoDu0 Formation of rainbows (& how far are they) Rainbows are formed by the dispersion of light & reflection (not total internal reflection) from drops of water. The rainbow color sequence can be analyzed by drawing a ray diagram of the refraction of sunlight inside water drops. https://cdn.kastatic.org/ka-youtube-converted/HLChkxfSUhI.mp4/HLChkxfSUhI.mp4 862 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class-10-physics-india-hindi/in-in-the-human-eye-and-the-colourful-world-hindi/dispersion-of-light-in-prism-hindi/e/rainbows 2026-04-08T00:16:02.937952483Z Rainbows Let's practice problems to better understand how rainbows form. Satrajit exercise https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:is-matter-around-us-pure/x46dd29ce84a663ea:solutions-suspensions-and-colloids/v/scattering-of-light-tyndall-effect 2020-12-29T16:19:57Z Scattering of light & Tyndall effect Let's explore the scattering of light with the help of an experiment. When we shine a laser through a glass of water with few drops of milk, we can see the path of light. This effect is often called the Tyndall effect.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/u58_VbsEYsBGIc6NKV0EcOpyFTvqmlK_0Bcc5izrVlBgCDiRLqSLBuzFqIz0TfYSx_9VGhUinbnm0sIxTQyvM-KD Scattering of light & Tyndall effect Let's explore the scattering of light with the help of an experiment. When we shine a laser through a glass of water with few drops of milk, we can see the path of light. This effect is often called the Tyndall effect.  https://cdn.kastatic.org/ka-youtube-converted/OXoKZPLb6Qo.mp4/OXoKZPLb6Qo.mp4 625 Dispersion and Scattering of light https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:em-radiation-from-the-sun/v/why-is-the-sky-blue 2024-06-03T02:12:27.034454813Z Why is the sky blue? Let's explore why the sky is blue, why the sunset/sunrise is red, why are clouds white. It's all due to scattering of sunlight by the molecules of our atmosphere. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/9517dbc3-6830-4400-bd6b-50f614b70f79_1280_720_base.png Why is the sky blue? Let's explore why the sky is blue, why the sunset/sunrise is red, why are clouds white. It's all due to scattering of sunlight by the molecules of our atmosphere. https://cdn.kastatic.org/ka-youtube-converted/9-i360iLjEo.mp4/9-i360iLjEo.mp4 606 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-atmospheric-refraction/v/why-do-stars-twinkle-but-planets-dont 2020-06-23T07:22:42Z Why do stars twinkle (but planets don't)? Let's explore what causes the twinkling effect of stars. We will also explore why planets, sun and moon don't seem to twinkle.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/of79dhOwowz6rpXpDBKHOUccBKjHSC2Wo9zGQnaD2LjYVqDtJxh5wDt-p9Pe72VuBq39Urkls9WvO8buo8KNbZjz Why do stars twinkle (but planets don't)? Let's explore what causes the twinkling effect of stars. We will also explore why planets, sun and moon don't seem to twinkle.  https://cdn.kastatic.org/ka-youtube-converted/73c_0ZAqSU0.mp4/73c_0ZAqSU0.mp4 462 Dispersion and Scattering of light https://www.khanacademy.org/science/in-in-class10th-physics/in-in-the-human-eye-and-the-colourful-world/in-in-atmospheric-refraction/v/advanced-sunrise-delayed-sunset 2020-06-23T07:22:42Z Advanced sunrise & delayed sunset Why is the sun squashed during sunrise and sunset? Why do we see the sun even before it rises? Our atmosphere is the main cause of this. We will explore these questions in detail.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/gziVHbCGiY9i63QyT5YxMnibSWbi_uZJAlgYuhuAmz5SXFEq06AnOAVyBrtFVJHWESyJwl3W1XIa-OuK5UjqytE9MQ Advanced sunrise & delayed sunset Why is the sun squashed during sunrise and sunset? Why do we see the sun even before it rises? Our atmosphere is the main cause of this. We will explore these questions in detail.  https://cdn.kastatic.org/ka-youtube-converted/7kAzunSPfpg.mp4/7kAzunSPfpg.mp4 544 Dispersion and Scattering of light