Refraction of Light

Подписаться 1,4 млн

Просмотров 380 тыс.

50% 1

120 - Refraction of Light
In this video Paul Andersen explains how light can be refracted, or bent, as it moves from one medium to another. The amount of refraction is determined by the angle of incidence and the index of refraction. Snell's Law can be used to calculate the angle of refraction. When the angle of incidence exceeds the critical angle it will result in total internal reflection.
Do you speak another language? Help me translate my videos:
www.bozemanscience.com/transla...
Music Attribution
Title: String Theory
Artist: Herman Jolly
sunsetvalley.bandcamp.com/trac...
All of the images are licensed under creative commons and public domain licensing:
Beltz, Ellin. English: Main Street Ferndale, California Refracted Upside down in a Contact Orb Juggler’s Crystal Ball at the Victorian Day Event., November 22, 2014. Own work. commons.wikimedia.org/wiki/Fil....
Graf, Friedrich. Deutsch: Illustration “Totalreflexion” Basierend Auf “Total Internal Reflection” - Für Die Miniaturdarstellung Optimiert., March 20, 2012. Own work. commons.wikimedia.org/wiki/Fil....
Inaglory, Brocken. English: Green Sea Turtle, Chelonia Mydas and His Total Internal Reflection., 2008. Own work. commons.wikimedia.org/wiki/Fil....
JrPol. Nederlands: Refractie in Een Glas Water, February 22, 2015. Own work. commons.wikimedia.org/wiki/Fil....
“Refraction.” Wikipedia, the Free Encyclopedia, April 2, 2015. en.wikipedia.org/w/index.php?t....
USA, Quinn Dombrowski from Berkeley. Marching Band, June 30, 2013. Marching band Uploaded by Anastasiarasputin. commons.wikimedia.org/wiki/Fil....

Опубликовано:

16 июн 2015

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 282

@anishtiwari1121 7 лет назад

Every school should show this.

@gdslowingunicorn1806 3 года назад

Mine is :)

@Hongsen 5 лет назад

That's a point I am looking for . Finally i have able to understood why bending of light related to the speed.

@anteconfig5391 3 года назад

what speed though? that is my question. is it the speed of light in the medium? or the frequency of light in general?

@tbcbruno 8 лет назад

thank you i learned more in 10 minutes than in a month of class

@itznotjes185 9 месяцев назад

It’s been 7 years, how’s life been treating you

@Catlover-yi4cw 4 месяца назад

@@itznotjes185 lmao 8 now - and 5 months for you, how’s life been treating you ?

@snip-sniptear956 6 лет назад

Thank you so much! I had to read the chapter and come back to this video several times to understand what exactly your illustrating when light-slows-down when it goes towards a denser medium (grass) and how light-speeds-up when it goes from a denser medium to a less dense medium (air)

@pipMcDohl 5 лет назад

the moving band analogy is great but i would have appreciate a lot if there was an explanation why light is working this way. one photon is one, he is alone, not four marching side by side.

@opulo1 4 года назад

Photons usually come in groups, as for why it's changing it's angle, the photon creates an eletromagnetic wave so changing the medium where that wave travels where it's harder to move the eletrons like water, this slowdown shifts the wave at an angle, at least it's what I've understood from studying it.

@DanielPilloff 4 года назад

The wave front doesn't have to maintain same distance, but it does remain in phase. See physics.stackexchange.com/questions/558397/can-a-light-wave-front-narrow-or-widen-in-refraction-and-what-does-this-really

@samtheexplorer4737 7 лет назад

i literally learnt more things in 11 min than 6 hours in class lmao

@ivankoh3779 7 лет назад

chen peiliang ikr ;D

@AakashDoshi2003 7 лет назад

same

@sarahvazquez7736 6 лет назад

Literally

@Will-os1zd 6 лет назад

same

@thedangerplayer5029 6 лет назад

chen peiliang yeah dude😎😎😎

@Aseelisthequeen 3 года назад

You're amazing! I appreciate your videos so much, not sure how I would've gotten through school without you!!

@titanicstuff2103 4 года назад

The best explanation I ever got about refraction. Thanks a lot!

@michellehammar3555 5 лет назад

Yes! You just saved me one day of studying! Like Chen said; learnt more in 11 min than in 6 hours of class!

@taskeentori9883 7 лет назад

Your videos make things clearer.thanks!☺

@melonheadyuki 8 лет назад

Thank you so much! This was so understandable!

@guillermofleitaspulido 3 месяца назад

This way of theaching is amazing, it should be a global standar!! Thanks for this videos Paul!!

@jasonjente6793 6 лет назад

Amazing video, it really helped me remember al the stuff I learnt from highschool! Really great and on point examples, thanks!

@SatishPandu-tk2qr 5 лет назад

this is the best video i saw till now about light and how it behaves thank you

@mayanksingh6916 7 лет назад

hi sir...... i want to thank you because your lessons helped me a lot......you also give quality of content and i hope your channel rises.....i wish you would have been my science teacher ;) (i live in india)

@duazia9737 4 года назад

I love the analogies! Helped me a lot! Thanks!

@nattinattson9562 4 года назад

Thank you for this video! :D Really liked the marching band metaphore. It made everything easier to understand

@craigcoates6247 5 лет назад

AMAZING, educational gold mine

@jaishetty8586 7 лет назад

one of the best lectures in optics.

@acesagayno 2 года назад

Finally. The video I've been looking for.

@renatao6330 6 лет назад

Best explanation I've ever seen.

@pauldong 4 года назад

I love the marching band explanation, it is the best definition for refraction. Other people will just, it changes speed, oh my god, but they probably don't even know the real reason. (*cough* *cough* science teacher)

@kronkite1530 4 года назад

Not according to Fermilab

@winstonsoh5255 7 лет назад

it is extremely helpful.Thanks so much

@parthsuyal5879 6 лет назад

thanks!!Wonderful!! Now I understood why light bends by the example of marching band.

@keonahandumon2322 8 лет назад

Thanks so much! I never really understood this lesson but you made things clearer! ☺️☺️

@SHADOWGAMING-fl4wf 2 года назад

Yes 🥰 me too ❣️

@olivier671988 7 лет назад

Hi i know that, due to the gravity, time is slower near massive object. I wonder if the effect of time distorsion is "equivalent" to the effect of transparent material (that you represent as sand) ? I know that in optical fiber light is bend by passing through a medium that has a gradient of indice. Is this effect the same when light passes through the gravity gradient of a star (so the light is bend too) ? Do you think the analogy with a tank turning by modifying the speed of its tank tread is worthwhile ?

@nineeleven9455 7 лет назад

How do you translate the marching band metaphor to light rays, as in, how does the part where the band members want to stay the same distance side to side relate to light rays? Thanks!

@DanielPilloff 4 года назад

@andBassandSwing 7 лет назад

Fantastic videos, thank you.

@wexer82 4 года назад

you're an amazing educator. thank you.

@randomstoday 4 года назад

you are literally saving my life

@SatishPandu-tk2qr 6 лет назад

Thank you so much sir, especially for refraction analogy 04:40 to 05:40 Thank you sir....

@arifbillahmeskat1724 7 лет назад

Thank you so much sir

@chikin.nugiesss927 4 года назад

Much better than learning at school for a month

@JihadAlAnsari 7 лет назад

Thanks, this is awesome

@LawatheMEid 7 лет назад

And what about the analogy of the critical angle? How to explain the synchronous between the photons in their marching?!! Thanks.

@Psyche.197 7 лет назад

amazing explanation!

@usaamabid4994 7 лет назад

This is really awesome

@anindobagchi3408 4 года назад

That was extremely helpful

@foreverboey 8 лет назад

This is sooo helpful! :)

@mohfa1806 6 лет назад

Hello, thanks for those great videos.....i have a question : when light passes from air to glass it bends as in the video , so why we don't see colors since it bends and velocity reduced ? .....thx

@camygiuliani8758 6 лет назад

fantastic video ! Thanks :)

@rmeducationcentre9435 5 лет назад

Very good explanation....

@ian.ambrose Год назад

Thank you, professor.

@pikasup1696 3 года назад

That analogy is ingenious. I understood light in an instant

@monight9631 3 года назад

Such a help full video thank you

@malekmalouka305 5 лет назад

That was very useful thanks.

@AshishKumar-jv6nj 4 года назад

So good explanation

@joudabudan4562 4 года назад

thank you so much i literally learnt from you more than my prof

@prateekjain81 6 лет назад

Yes it was very helpful .Thank you very much

@feelingzhakkaas 7 лет назад

Nice video, thanks. Do you have videos on 'why the speed of light reduces in dense medium' ? What is the reason for slowing down? is its interaction with medium atoms or something?

@rdotkey 3 года назад

In the video at about 2:40, we see the beam being bent towards the normal, which would indicate n_2 greater than n_1. That means the light is slowing down as it goes from material 1 to material 2. Paul then extends this to Critical Angle, which happens when n_2 less than n_1 - not the way it is shown. Think of this as when light coming from under water is going into air. The index of refraction of water is greater than the index of refraction of air. So for angles near the normal, light moving in this way would bend away from the normal, because it is speeding up at that transition, and this could then be extended to critical angle. Otherwise, such a good video!

@subrodeb9085 3 года назад

Superb Sir..Thank You

@k0be55 9 лет назад

Appreciated

@Will-os1zd 6 лет назад

Thank You so much for this it helped me on my science fair project

@icici_ 3 года назад

how did i learn this whole concept in an 11 minute video compared to a 3 hour class, which I understood nothing lmaoo. Thank you so much !!

@havardamundsen901 3 года назад

Hah, this was awesome. So easy to understand :D Thank you!

@AhmedAli-qd1hu 4 года назад

That was awesome😊

@zohartrainin4493 7 лет назад

Can there be a state where the angle that the beam hits the surface of the water (the beam coming from the water to the air) is an angle larger then the critical angle and the beam will be both reflected and a bit transmitted into the air?

@caroline8239 8 лет назад

Thanks so much for these videos they are more helpful than my teacher :/

@mridulboro7467 Год назад

Waow it was amazing. Learned a lot. Thank you so much sir.😁

@cgm778 6 лет назад

I like the marching band analogy. I get that the sand is analogous to the material. Sand slows down marching because some gets displaced with each step, but how is that analogous to what slows light down?

@Suesco 3 месяца назад

what im trying to understand is by what mechanism do the marchers have to stay equal distance apart? what stops the waves from breaking down/spreading out? doesnt this mean that light waves have some kind of tension holding them together laterally? is it the magnetism?

@zu5926 Год назад

It was very helpful

@DownhillAllTheWay 3 года назад

At 10:56 - "remember, they're going to keep the distance between them the same" They can't. If we are marching, say 1m apart, and the rank in front of me slows down, then I am going to get closer to the soldier in front.

@DownhillAllTheWay 3 года назад

@Nate Borg Yes, I agree that it makes sense. I was just nit-picking about the distance between band members. They, of course, can be trained to alter their behaviour, whereas training light waves is a non-starter. But just as the band members get closer while they are marching slower (in the glass), the light wavelength also gets shorter, then expands to normal again when the light exits the glass.

@MonkeyDLuffy-xr4fl 7 лет назад

As a chem major, I totally though n=c/v at 3:07 was concentration, and I was amazed for a moment xD

@taliawang9425 6 лет назад

Hi, but may I ask, to which degree does the light bend? because I don't see a specific degree that the refracted light can bend towards. For example, for the law of reflection, light reflects the same angle as the incident. Therefore, what would be th especific angle for the refracted light ray?

@thebrats267 4 года назад

love the vid

@phantxm7699 5 лет назад

that marching band analogy really helps

@jollyjokress3852 3 года назад

*Why doesn't the first one that enters the sand push the ones to his right so distance is kept?* Couldn't he just go in straight and the others become slower once he enters the sand? (I bet it has to do with lowest energy state).

@snoitseuqpi1119 6 лет назад

Question: Are objects technically every color they absorb, or are they the colors they reflect? Perception wise I know we see what is reflected, but as far as energy, would a leaf be every colour but green, due to it converting the rest of the energy being used to make the leaf? I am trying to understand colour absent of our eyes, and on a energy basis. Colour doesn't exist absent of light, and then the physical properties (including the energy levels of the atoms) will also change the way an object reflects colour (i believe vanadium and mercury depending on physical energy applied will change from lower to higher energy states and back as electrons jump, and chang colours accordongly). I just want to know, could objects be more accurately described as the light the absorb, or in all definitions are objects defined only as the light the reflect? And also could a light source change a physical property of an object (adding energy to it) to make it reflect more or less of certain wavelengths (eg diffuse/ambient vs high energy photon beams)

@DivyaAthalye 4 года назад

Thank you for the match band.

@fortniteistrash1150 4 года назад

Learnt way more than a tutor could teach

@balreddy7929 5 лет назад

Sir do reflection and refraction occur at the same time?At a glass surface

@rudrasingh-vy4th 5 лет назад

how did you go from theta2 = sin -1 .577 to 35 degrees. I don't get what operation I should do to convert .577 to 35 degrees

@TheHHPodcast 7 месяцев назад

this is amazing

@gregritchie1758 5 лет назад

best type of glass for passive solar panels with fixed plane facing south?

@LowtechLLC 5 лет назад

If the light slows down why does it stay red? How come 650nm doesn't become a shorter wavelength? If air to glass has an index of refraction of 1.5, shouldn't 650 nm / 1.5 = 433.3 nm = blue. What am I missing?

@akees2799 5 лет назад

Color depends on the wave's frequency rather than it's wavelength. Frequency remains constant when light travels through different mediums. The speed, however, does change and so does the wavelength according to Speed=Frequence x wavelength.

@EagleSlightlyBetter Год назад

what is the link between the members of the marching band and the wave of light? Are the band members photons? Why do they maintain spacing in the rows but not the columns?

@sopwithcamel5519 3 года назад

But doesn't light move at same speed always? What do you mean it travels faster through one medium than another?

@marianowicka6147 4 года назад

super helpful!

@notadoctoryet6040 6 лет назад

He helped me in bio, he helps me in physics. My guy is the Jesus of science.

@thedisintegrador 6 лет назад

Yes he is miraculous

@willingoYT 4 года назад

That was amazing. The only things not immediately evident are the snowglobe's inversion of light and the total internal reflection from the turtle, but those were side comments anyway.

@yashadizero 8 лет назад

Thanks

@parthpathak4490 5 лет назад

great analogy

@adityapranav6578 7 лет назад

Thanx bro this will surely help me in my ot exams

@dhrubajyotidutta3297 6 лет назад

Y'r awesome man thx😁

@MarwanKhan 6 лет назад

Thank you!

@RuslanLagashkin 5 лет назад

But why do they try to keep same distance between each other? In the same simulation, if we change the representation fron "ray" to "wave", the diameter of the light ray changes (in a same way the objects appear magnified aftet going through the glass of water in the beginning of the video).

@johnf.kennedy1866 6 лет назад

really awsome

@Thesussy1boy 5 лет назад

Thank you!!!

@gabrielneibrief5298 5 лет назад

I think I might actually pass my Chemistry final tomorrow!! Thank you so much! :)))

@SHADOWGAMING-fl4wf 2 года назад

Nice one 🐱

@anteconfig5391 3 года назад

Hi, sorry, 2:52 n=c/v you say "v" is speed, but what speed? The speed of the medium through space? or do you mean frequency? 3:04 "Because the index of refraction is equal to the speed of light divided by the velocity" my question just is "what velocity?"

@sanjoymondal7922 6 лет назад

well explained the refraction

@TemeraireBjartskula 6 лет назад

Marching band! I should remember that one, that would really help me remember in which way to go XD

@anthonygachoki9262 4 года назад

Can't believe there is a dislike on this video maybe those professors

@ToMinecraftAdventure 6 лет назад

Cant wait to use this in my everyday life..

@strategen9124 6 лет назад

Jose Calderon knowing about the laws of the universe and how it works is supposed to give u pleasure

@strategen9124 6 лет назад

Jose Calderon by satisfying your curiosity

@kappnspacey8664 6 лет назад

i feel it

@argrusvfx1582 5 лет назад

Im watching this to revise for science, i got an exam tomorrow haha

@ginobilly 5 лет назад

Question: If there is a glass with same density with a changing thickness ( increasing gradually ) with a light at the same angle..how does light know that it should refract or completely reflect, from the surface when the thickness is thick enough..

@pigofapilot1 5 лет назад

Nobody really knows. This is quantum mechanics at work. Light reflects from both the upper and lower surface of glass but there is never interference between the two regardless of thickness, otherwise we would get a double image. How the photons 'know' the thickness of glass is a mystery of quantum mechanics.