How Do Polarized Sunglasses Work?!
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- Опубліковано 16 жов 2024
- Many of us have polarized sunglasses, but how does an optical polarizer actually block light? It has to do with the polarization of electromagnetic waves and the vibration of atoms in transparent solids.
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The weirdest thing I’ve noticed while looking through polarized sunglasses is my brother, but I doubt that had to do anything with the polarization.
LOL, LMAO
Haha!!
Ha
@Jamal Joziah scamm, and the next comment is scam too... ../.
@@prosperityx_TMC They've been hiding underneath popular comments all over the channel (and my friend's channels). Thanks for letting everyone in this thread know. I've reported all of them as a spam.
I accidentally discovered that rainbow light is highly polarized.
I was driving home from a long day at work. Behind me was a clear and very sunny sky and ahead was a rather large rainstorm producing the most vivid rainbow I had ever seen.
I was wearing my polarized sunglasses (if it wasn't clear from context) and like I said it was a long day so, without changing my gaze (I was driving after all) I stretched my neck to the side and suddenly the rainbow practically vanished. It completely shocked me and was totally unexpected. 🤩
Omg wow!
Re: rainbow: I hope to try this someday! In physics class, my partner noticed my Mac M1 laptop polarized into a deep purple, and his iPad polarized into black. We're curious as to why!
finally, an explanation that truly explains how polarization of light actually works. thanks and subscribed
late but yeah subbed too :-)
The coolest thing to see through polarized sunglasses are stress patterns in materials, especially glass, and especially car rear windshield glass. For many modern cars, usually a checkerboard pattern may be seen when the polarization axis is at the correct orientation. (Tilt your glasses a bit if you don't see them right away.) This is due to the tempering, done to control fragmentation when the glass breaks, by blowing cool air onto its surface while it is still hot and being shaped. The checkerboard actually shows the location, and sometimes even the shape, of those cool air nozzles.
I've seen this! It's a brilliant way to engineer parts. You can make it out of clear plastic first to see where the stress points are.
Your animations are top notch now, great job!
Robert Sparkman ikr. He deserves way more views
Nick! I just found you about a week ago, and I've subscribed and watched damn near everyone of your video's. And not one video have I not watched to the end. You are simply awesome at putting together these videos and more importantly explaining physics and science to a noob like me who has no education other than developing a super strong interest in physics in my late 30's. Please keep them coming. Thanks so much for what you do!!
Glad you like them :-)
This channel needs more subscribers. As person who love these type of content, how has UA-cam hidden a creator such as you for so long ! Loving the vids
I was looking at some high cirrus clouds made of ice crystals. The sun was above at just the proper angle that when I looked at them with polarized glasses, I saw a color light show in the clouds. Rainbows were interacting like a plasma fractal putting on such an incredible color show, my mouth was literally hanging open in complete awe. It looked like a psychedelic light show in the sky and went on for hours.
Another excellent video. You always take the topic one step deeper than most popular science presentations, and you make it easy to follow as well. Thank you!
It's nice to hear the depth is appreciated :-)
I have always loved the coloured patterns you get looking at things like transparent plastic boxes through polarisers.
Nick, the most amazing thing I see with polarized glasses is the true dominant color of the daytime sky. With polarized glasses, the violet that we normally can't see, comes right out clearly visible and dominant in color.
I cover my phone camera with my sunglasses to take better pics of clouds. ;-)
Buck Rogers wow good idea I think I will actually use that when I eventually have too
oh damn i didnt think about that
Yeah good 💡
Great video! 2 questions:
1. Do polarized Sunglasses protect your eyes from the sun's UV rays?
2. Are all polarized lenses the same? For example, a $10 polarized pair of sunglasses from the gas station versus a $200+ dollar Oakley or ray ban?
1. Usually yes. But it's not the polarisation filter that does it. Glass offers a little UV protection anyway, but typically have an additional UV protection layer added to filter out the rest. Plastic lenses are actually better at filtering out UV inherently.
2. It depends. Here in the UK our sunglasses are marked with the UV rating, so it's entirely possible to find a cheap pair of sunglasses that are just as protective as an expensive pair. In terms of the polarisation filter, cheaper glasses are likely to have this applied to the front of the lense so are more prone to this wearing out over time. More expensive sunglasses will have the film sandwiched between two other layers so they'll last longer.
This is such a good explanation. I’ve never seen such a good explanation of this before
this was a really great video that explained this perfectly, always wondered how polarized lenses let you basically see through water. I use them when fishing every time, never go fishing without them. there is a reason all the pro bass catchers wear them, because it gives you an advantage when you can spot fish without a radar.
I remember when we studied polarised lenses in school, and I thought this would be an interesting replacement for blinds/curtains, and then I realised someome had already done it...
I broke the display of my iPhone and got it replaced. After replacing, I wasn't able to see anything on the screen with a polarized sunglass on and the phone in a portrait position. I was able to clearly able to the contents on the screen when I rotated it.
Till now, I was thinking that the new display was a fraudulent one!
Nope! Just a different design :-)
the weirdest thing I noticed was actually by polarized filter in my camera while I was playing with near the river with sun in front of me, than I noticed that when the angle is perpendicular to the surface, than you can make a nice photos of the rocks and fishes beneath the surface :)
Whoa this is my first time on this channel and I love it! It's like @SmarterEveryDay meets Craig Middlebrooks from Parks and Rec
Finally a proper explanation of polarization! I cry the tears of joy.
I'm learning about polarimetry this semester and you just explained this brilliantly! Thanks :')
Glad I could help 🤓
I realised that polarised glasses give you X-ray style vision into water at the beach on a hot summer day. It removes the glare coming off the surface and frees the view a few meters down. Found that endlessly fascinating. Sure the water must be clear.
Excellent. That clears that up. You’re really good at this; keep ‘em coming.
I've found it's best not to wear polarizing sunglasses while mountain biking. The ground can have different surface conditions and sometimes they vary wildly from one section of trail to another. Being able to anticipate how grippy the surface is before I actually get to it is important when taking corners at high speed. Usually the best riding conditions are a day or two after it rains so the ground is wet but just starting to dry out. However, there is a situation that can occur where the trail seems to become "greasy". I don't know exactly why this happens but the coloration of the dirt can actually have a sort of sheen like you might get from an oil stain. I don't think there is actually oil on the trail. It's more like the mud itself takes on an oil-like property. But being able to spot the greasy dirt vs the grippy dirt is pretty important. But polarizing glasses essentially erase this information from your vision. The sheen completely vanishes unless you sort of tilt your head.
great video editing man! one of your best so far! making quality videos like this takes time but it'll be worth it! keep it up!
I had a class in college that we used polarizers at 90º to each other to see residual tensions on acrilic components by puting the part between them and shining light through it. it was cool!
Polarizers are useful like that.
I have a degree in physics, but this helped me understand light polarization better - especially glare reduction. Thank you!
At last, a decent description of polarisation that I can understand! Many thanks Nick.
great stuff! been looking for a video that really explained this phenomena for a while
Glad I could help! 🤓
Your Concepts and Explanations Are Great much better than the Books. And Great Animations Tooo ...
I don't really have any sunglasses stories because I don't wear them often. But I just wanted to say since this is the first new video since I started following, after binging a number of your videos and noticing how virtually all of them have people saying you should have more followers, you have one more now. This is awesome stuff. Keep it up! Always excited for more
Welcome :-)
@The Science Asylum, How have you not reached 100k+ Subs yet? Love learning, keep it up!
This explains it perfectly, my goddamn teacher took an entire hour to make it make sense. I guess my professors' brainwaves are polarized in the direction those electron clouds in my neurons leave out.
Good one bud XD
This is the best explanation of polarization ever, and that's not even the title of the video. It's beaten MIT's lecture on this topic.
After finally a lot, I finally found a clear visual example. Thank you a lot.
Glad I could help 🤓
Years ago when I was making my own telescope mirrors I learned a way of testing the glass to see if it was free of internal stresses. You take two polarizing filters, sunglasses will work, and turn them 90 degrees to each other and look at the glass blank and if you see a Maltese cross then the glass blank has internal stresses and should not be used.
Why did I waste me time going to lectures when I could just watch Nick. These videos give me more of an intuitive feel for things which are otherwise just memorised. Many thanks to you sir.
Wow my friend your on your way to 50k subscribers congrats 😀 & I love your videos very educational
Great job Nick! :) Love your videos :)
This channel always has a video of the strange phenomenon I'm curious about. keep it up nick!
I was motivated to look up this video because I just noticed that my polarized sunglasses allowed me to see much further while driving through blizzard conditions
Thank you! You helped me with a project as I don't have polarized sunglasses to test this out myself!
Glad I could help.
Does air work like glass and so succeeding layers of air absorb the light and air atoms wiggle creating their own light?
That was an awesome explanation.nice work mister 👍👍👍👍👍👍👍👍👍👍
once in awhile, one stumbles upon something worth keeping, kinda like a swiss knife, keep that cuz u never know when u might need something it offers... u sir is a swiss knife. u will become useful to me someday 100%. sub'd.
The way he started the video is crazy😆.. and I love it. I must be one his 'hey crazies'🤣🤪
I really enjoyed making that intro.
Thanks to making such helpful video
It cleared my concept for class 12th examination
Recently I got my hands on the 3d cinema glasses and finally did the experiment with a mirror. Also when I move them like in 5:33 looking through them from the outside then it works, but when i look through them from the inside, then screen becomes yellow in one direction and blue in the other.
I noticed car windshields and Auto Glass have a checkered grid of dark spots on them when looking with polarized glasses. Why is that? Great vid btw.
Craig Symalla loads
That glass has been tempered and the uneven cooling creates patterns in the glass. I'd guess those patterns create filters for light that are further filtered by your sunglasses.
I believe it is to do with stress. As ML says, the uneven cooling creates the pattern, specifically a pattern of variable stress. The stress then causes the glass to interact differently with polarised light at different locations in the glass. Polarised light and perspex models, that behave the same way in stress as glass, are used by some engineers to identify locations of great stress in e.g. an intended bridge design.
Thanks! Wanted this answer a long time.
To me the cool thing about this video is not about the polarization of light but how the glass does not actually passes light through instead its atoms absorb the light and re-emit the light again. At least this is what I understood from 2:00-2:35.
Indeed!
Thanks for teaching us general relativity.
01:20 it's crazy you found a microphone small enough to capture the sound of an electron jumping to a higher energy level.
😆 I was _shocked_ when I learned that's what they sounded like 😉
I work out side and i love them I got some oklays , and i can see so much better it just makes everything look better
When wearing polarized sunglasses while using my Canon camera, viewing the LCD screen in landscape orientation and everything is all good. Looking at it in portrait orientation and "poof" everything disappears - its a blank screen.
When I was much younger I noticed spots when looking at water with sun glare only at certain angles. After having Lasik surgery polarized glasses have a smoky haze. I've always been able to see patterns in the polarized glasses but now it's just a haze that completely goes away with non polarized glasses.
Damn. Learned something new today.
Thank You for the great explanation!
Hey chandler keep up the good work love your videos and can't wait to see you cross 50k subscribers☺☺
wait. so why there are glasses that get clear indoors but gets dark on the outside light?
I'm pretty sure that has to do with UV light. There's no UV light indoors.
what about 3 filters one at 0 degrees, 2nd at 45 degrees and 3rd at 90 degrees? If we take only 1st and 3rd we get no light coming out, but if we put 2nd between 1st and 3rd some light passes
When you look through polarized sunglasses at hardened glass, ie. a rear car window, there's a rainbow coloured pattern in the glass you don't see otherwise.
You're seeing the stress points in the glass :-)
Right, but what is the physics behind that...
At the beginning of 3D movies in cinemas there is a short moment where you can’t see anything with your right eye through the 3D glasses. Is that because of polarization?
I've never noticed, but that's probably because that segment is only from one of the projectors. I have a video on 3D glasses if you're interested: ua-cam.com/video/-SMpGiNVymU/v-deo.html
Please follow up with circular polarisation, and the quantum voodoo that happens with 3 polarizers !!!
Fabulous! I finally cleared out my doubts. Thanks a lot
Glad I could help! 🤓
A new Vsauce + new Kurtzgesagt + new Smarter Every Day videos,
to top the week off, there's a new Science Asylum video!!
ALL THE VIDEOS!
love your work nick!
this is my first time on this channel and I love it!
The weirdest thing I’ve noticed while looking through polarized sunglasses is on high end German cars you can see the film in between the windshields as purplish green color!
Thanks for the valuable information, but I want to ask, I see through the polarized sunglasses the sun reflected in the glass of cars in the form of a blue dot. Isn't this a blue light pass to the eye and is it dangerous؟ Thanks again
Thank you, I'm very interested in the photoelasticity phenomenon, so this video really helps understanding some basic things :)
Best video so far about this subject.. Thumbs up 🙌
How come there’s only one such video on polarisation on yt!?!??! Anyways this video was realllllly good and very helpful.
At 4:15 and onward, you illustrate a single em wave passing through the polarizer at an angle to the polarization axis. I understand about the polarizer passing only the vertical component of the vector, but you say that because its magnitude is smaller than the original vector, the outgoing light is dimmer? I thought brightness had only to do with the number of photons, not the energy? (I'm not gunning for Pedantic Clone's job; I'm just trying to get my ducks in a row in preparation to ask you a huge question soon.)
hats off to you man !!! great animation and explanation !!!
Thanks a lot for this fast and rich explanation.
Another concise explanation for something as common as sunglasses thanks
You have the best science content on UA-cam
Absolutely excellent video! - From a Teacher
So what kind of black magic is when you get light pass through 3 polarizing glasses, but it does not pass through two of them?
That's quantum magic... I mean, mechanics.
I don't get it. You filter the light in one direction. Than filter it through perpendicular filter, there is no light. You add third filter and voila you get some of the light :(
Kristijan Siskovski
ua-cam.com/video/MzRCDLre1b4/v-deo.html
check out this video and its accompanying one
The Science Asylum - can u make a video describing what happens on the quantum level? Pretty please! Btw love ur content!
Kristijan Siskovski As far as I understood it, light only has a chance of passing, when the difference in directions of the polarizers isn't too much, so I guess it kinda... turns? It turns a little through the first polarizer (at least the part that doesn't get blocked), same with the second and third. But if you have 2 polarizers perpendicular toeach other, the difference is too big and the light has no chance of getting through...
But I don't know if this is even remotely correct ^.^'
5:04
But why? Why is it that at Brewster's angle, when the refracted ray is perpendicular to reflected ray, the light gets linearly polarised? I've checked everything online and i cannot understand the reason behind it. Guess I'm too dumb. Someone help.
I've been reading up on this too, but there doesn't seem to be an explanation past, "its mathematically convenient". The Brewster angle is really just a convenient solution of one of Fresnel's formulas, in the case where p-polarised light 'reflectivity' is equal to 0. Fresnel's formulae are derived from Snell's law (e.g. the laws of refraction), so the best classical description would just be, "light travels between two points along the path that requires the least time, as compared to other nearby paths", which is Fermat's principle. Here's the wiki on Fermat's Principle, it might have what you're looking for: en.wikipedia.org/wiki/Fermat%27s_principle
The most beautiful description on web
Thanks! 🤓
@@ScienceAsylum your sincerely
I have noticed on some occasions that groups of identically oriented LCD monitors setup to display to the public are sometimes not identically polarized.
When looking at the whole group through polarized sunglasses, most of them can be seen, while others appear black. Then when I tilt my head to the side, the black monitors can then be seen and the others have turned black.
It would appear that the manufacturing process can be a bit inconsistent with respect to the LCD polarization.
Interesting...
Woah just when I thought I knew everything about this topic. I was wrong. Nice videos keep it up!
your videos are great, I dont get why you are not more popular XD
he'll get there :-)
@2:00 I don't get what happens to the original photon if it gives energy to vibrate the electrons? Can a photon lose energy but not disappear? Does it result in a wavelength shift?
Amazing physics of our universe and greatly explained nick
Wonderfull!!! But I'm not sure if I understand it correctly. Do light that goes out of polarized glass is actually emitted by polarizer? It's not the same light that went in?
I like to think of the light being emitted as different than the light that entered. It just makes the most sense to me. In the end though, it doesn't matter. The universe doesn't care if it's the same light or not.
I cant see a single thing on my phone when its vertical, but when I turn it horizontal, everything is visible. My old Iphone's screen is visible from all angles but there's a funky rainbow pattern. My laptopscreen (thank god) is visible in the normal position but just black when I turn it 90 degrees. Cool stuff!
Super cool! Thanks!
I don’t know if it is weird or not but the first thing I noticed about my polarized glasses is being able to see the design in tinted windows. About quarter sized dots running parallel across the window. It took my a while to get use to that.
What you're seeing are stress points in the glass. We actually take advantage of it in engineering when designing parts of machines. We make the part out of transparent plastic first to see if there are unexpected stress points we need to fix in the design before we actually make the part.
@@ScienceAsylum that’s awesome!! Why do those points only show up with tint and polarized glasses?
great explanation !
I am very glad to see that you are making your videos. Please keep making them
i have a question i understand that electrons vibrate in presence of electric field and it produces it on light but what happens to the original wave and second question how polarizer oriented 90 degree blocks the light if it cant absorb that light it must transmit it but how it absorb
Finally an answer that's more than "Because it blocks light that doesn't match its polarization axis".
Amazing explanation!
I gave you a thumb with up polarization!
the thing with the computer screen is really cool :D thanks made my day
Very well explained!!
If you remember me, I wrote you about 1 month ago about my thoughts on vibration amplitude, frequency and so on.
And I have come to the conclusion that the statement "atoms vibrate faster when heated" is true. But we have to differentiate between faster vibration and higher frequency. If a material gets heated and the vibrational amplitude gets larger, the atoms must travel the same distance faster to keep the frequency of vibration constant. A frequency shift is not what we perceive in IR spectroscopy so we can conclude that heating up materials does not make them vibrate more often per second, only accelerate faster and travel a bigger distance faster due to a larger amplitude.
Am I right now?
Thx
hi ,
one question
if i use polarized glasses in front of my screen laptop , thats protect my eyes from blue light?
thanks
No, the polarizers won't specifically block blue light. They _will_ block all the colors of light by a certain amount though.
Great explanation
Great topic, thanks for sharing!