If light slows down when it passes through water how does it speed back up when it leaves the water?
Leaving the water.
>>16965849Light is always going to move as fast as possible by default. If it's a vacuum, it goes to the fastest possible speed that anything in the universe can move. When there's something in the way that causes it to move in a curved path or makes it refract repeatedly or absorbs and reemits it or fucks with the field in other ways then it's going to be slowed down, but it's still moving at the maximum possible speed in that medium. As soon as it's out of the medium, the new maximum speed is now higher so it moves that fast now.
>>16965849https://youtu.be/CiHN0ZWE5bk?t=7m40s
Light (photons) has zero invariant mass (or rest mass), meaning it cannot exist at rest and always travels at the speed of light. Although massless, light possesses energy and momentum allowing it to exert pressure and be affected by gravity, but it does not have the intrinsic "stuff" or rest mass that solid matter does.No Rest Frame: Light cannot be slowed down to a stop to measure a "rest" mass; it only exists while in motion at C. Interaction with Higgs Field: Particles acquire mass by interacting with the Higgs field; photons do not interact with this field, thus they remain massless.
Light moves at the speed of light. Water just adds refraction index value.
>>16965849That's an odd initial question to ask. How about you answer me this question first OP: why did light slow down when it entered the water in the first place?
>>16965849it just does. okay?
>>16965880because the aether is different inside the water due to an increased energy field.
>>16965849https://en.wikipedia.org/wiki/Ewald%E2%80%93Oseen_extinction_theorem
>>16965849Because it's an oscillation and will be transported at medium propagation speed. This is obviously true even in nonexistend mediums.
>>16965884ya ok and chucks sneed just feeds
>>16965849Yes. Since you are using water as an abstraction we can talk about this from a high level. >>16965853>>16965871>>16965874>>16965880Technically incorrect for the above reason.
>>16966525You can't read
>>16965880> why did light slow down when it entered the water in the first place?It doesn't. What you are rarely told is that all the photons involved are still moving at c, even inside the water.Since light is a changing electromagnetic field, and such fields interact with electric charge, that means as the original light wave moves through the water it interacts with all the electrons and protons in the material. This causes all those charges to move slight, however moving charges also produces an electromagnetic wave.So you have the original light wave and an induced light wave at a different wavelength. Add together all those waves and you get constructive and destructive interference, resulting in a combined wave with an effective group velocity that is less than c. That is what we perceive inside the water. Once the light leaves the water there's no longer any induced waves and you are left with only the original light wave again.
>>16966641I wonder if you could detect the first front of the incoming wave passing through the medium with c.
>>16965849if you can stand half an hour of gay rambling this explains it perfectlyhttps://www.youtube.com/watch?v=KTzGBJPuJwM
>>16965849It only appears to slow down because of interactions with the atoms. Between the interactions it's traveling at the same speed as in vacuum.
