E9.5 A - Light Speed Is NOT Constant In Vacuum. Here‘s The Proof. Ask Us Whatever.

Have you ever wondered how refractive media like water and glass affect the speed of light? Or why light is always calculated as speed c/n? Then this episode of the Ask Us Whatever special relativity series is for you. Joe Sorge walks us through the challenges of measuring light speed in a single direction and explains why light speed measurements are nearly always round-trip measurements. Contrary to accepted dogma, Joe shows us how to work out the math to prove that a Sagnac device will indeed reveal the one-way speed of light relative to the motion of the device. He then demonstrates how it is possible to calculate one-way light speed through a refractive medium as measured with a single clock in a stationary frame. This episode provides all the tools to begin understanding how light interacts with a refractive substance, as covered in the following Episode 9.5.B.

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#Einstein #SpecialRelativity #Physics #TimeDilation #veritasium

Written and Produced by Joe Sorge.
Directed and Edited by Sascha Fridberg.
Filmed by Sascha Fridberg, Scott McKay Gibson.

3D Animations and Modeling by Jacob Lipsky, Scott McKay Gibson.
2D Animations by Bianca Volper, Jacob Lipsky, Cory Smith, Sascha Fridberg.

Composer Andrew Sorge.
Theme Music by Scott McKay Gibson.
Sound Design and Mix by Paul Hackner.