176
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 29 Apr 2024
176 points (98.4% liked)
Videos
14315 readers
212 users here now
For sharing interesting videos from around the Web!
Rules
- Videos only
- Follow the global Mastodon.World rules and the Lemmy.World TOS while posting and commenting.
- Don't be a jerk
- No advertising
- No political videos, post those to !politicalvideos@lemmy.world instead.
- Avoid clickbait titles. (Tip: Use dearrow)
- Link directly to the video source and not for example an embedded video in an article or tracked sharing link.
- Duplicate posts may be removed
Note: bans may apply to both !videos@lemmy.world and !politicalvideos@lemmy.world
founded 1 year ago
MODERATORS
"Light changes speed" ???
Yes, what we call the speed of light is really the speed of light in a vacuum. When light passes through a medium like water or glass it travels slower. That causes the light to be refracted which means that it changes direction slightly based on the energy of the light (color) and the refractory index the material. Glass will refract a red laser by a certain amount while water will refract it by a different amount.
Fun fact, because different colors refract differently, when you shine a white light through a specially shaped piece of glass called a prism, you will see a rainbow pattern.
https://www.science-sparks.com/wp-content/uploads/2019/06/shutterstock_1194072568-1024x606.jpg.webp
TIL, thanks!
Also a gas! Astronomical spectroscopy is fascinating.
"The star radiates at [these] wavelengths meaning it has [this] composition, after the light bounces off/through the planet we see wavelengths, meaning it has composition."
I’m annoyed someone downvoted you for asking an innocent question
Yes? C is constant and light travels at C in a vacuum, but lights speed is different in other media.
Congratulations! you are one of today's lucky 10,000!
Wait till you see gravitational lensing!