Demonstrating diffraction using laser light - for teachers

  Рет қаралды 151,410

Institute of Physics

Institute of Physics

5 жыл бұрын

In this short video, from the Institute of Physics and the National STEM Learning Centre and Network (www.stem.org.uk/), Michael de Podesta explains how a laser can be used to show the diffraction and interference of light. Using a laser pen in the classroom, the wave nature of light is demonstrated as a thin wire is used to generate an easily-seen interference pattern. Two versions of the video are available. This one is suitable for teachers and fully explains the demonstration and how the interference pattern is produced. The second is aimed at students and could be used in place of the demonstration.

Пікірлер: 99
@cynagye2096
@cynagye2096 3 жыл бұрын
Looking at how he is explaining makes me love physics
@hoofheartedicemelted296
@hoofheartedicemelted296 2 жыл бұрын
The difference between college and university level learning is in university level you are "reading" whatever subject matter, so in effect you are teaching yourself. Where as in college the teacher is teaching you, relaying the information and laying it all out for you and hopefully simplifying the subject matter as much as possible. I asked my brother how is it you have taught yourself to use cubase which at the time, many years ago, there was no tutorials for it. He said "if you have a passion for something, you will have eagerness to learn and it will be absorbed much easier". Well I have a passion for optics, but I'm still baffled and this teacher has made perfect sense. I'm struggling with a lot of the subject matter so diverse is it, but what he just explained was easy to absorb and made sense. Sometimes you just need the best teacher. The institute is blessed to have him. I am currently reading a book I bought called "Optics The Science of Light". It also has the IOP mark on it, and it's a fascinating read. But God what I'd give for someone to explain it in videos like the video above. I wish that this subject was available when I was at school. I think my life would have turned out quite differently indeed. Thank you good teacher for passing on this knowledge of physics and the science of light.
@Mufti199
@Mufti199 4 жыл бұрын
Such a brilliant experiment! I'm definitely integrating in this in my class
@lorentz1617
@lorentz1617 3 жыл бұрын
Definite integration 🙄
@bethevers6391
@bethevers6391 3 жыл бұрын
Thank you so much for a lovely demonstration to use in class.
@pinacolarusso
@pinacolarusso Жыл бұрын
This is a brilliant video. Short, rigorous yet fun!
@LuvinaMacondo
@LuvinaMacondo 4 жыл бұрын
Thanks! That's what I was looking for.
@kalitgautam
@kalitgautam 4 ай бұрын
The most beautiful Diffraction video I have seen till date !!!
@exoplanet11
@exoplanet11 3 жыл бұрын
Thanks. A much better video than the old one MIT has up on the topic. Modern and conceptual. I am using this video for my physics students at San Francisco State Univ.
@maxheadrom3088
@maxheadrom3088 4 жыл бұрын
I did it using two razors to form a slit. Excellent video!
@physicslelo7614
@physicslelo7614 Жыл бұрын
Amazing style to teach and demonstrate.. loved it
@arvind7820
@arvind7820 2 жыл бұрын
Great Explanation sir. 🙏 🙏. The most aprecite thing is the quality of the images.
@Spoder_07
@Spoder_07 2 ай бұрын
His voice is so soothing, it made me forget I'm seeing this for homework
@fatimamir2006
@fatimamir2006 3 жыл бұрын
Thank you Sir It was so interesting and easy to understand with more focus
@parithimathi
@parithimathi 3 жыл бұрын
Excellent demo. Thanks. I'll use it in my class
@kurshidulalamlaskar8744
@kurshidulalamlaskar8744 2 жыл бұрын
Thanks to you for clearing my doubts regarding this topics
@rasheduddin8811
@rasheduddin8811 2 жыл бұрын
loved this video presentation. awesome!
@varshakhadilkar1646
@varshakhadilkar1646 3 жыл бұрын
Who all are jee aspirants here
@michelecutini1503
@michelecutini1503 4 ай бұрын
Excellent work, well done!!
@padmalathaumesh5590
@padmalathaumesh5590 7 ай бұрын
Very beautifully explained, experiment is demonstrated so well, tku sir
@sheetalarya9669
@sheetalarya9669 2 жыл бұрын
Amazing Sir 🔥 Love and Respect from India 😊
@NikitaNair
@NikitaNair 3 жыл бұрын
Amazing explanation!!
@iamvanshchauhan
@iamvanshchauhan 2 жыл бұрын
Brilliant experiment
@dadagdadig5344
@dadagdadig5344 3 жыл бұрын
Thankyou sir , I was just looking for this explanation.
@physarif
@physarif Ай бұрын
Great explanation.
@nikorahmad
@nikorahmad 5 жыл бұрын
Im a physics teacher from Indonesia and i love it.. 👍
@SuperBhavanishankar
@SuperBhavanishankar 3 жыл бұрын
Hello sir
@nikorahmad
@nikorahmad 3 жыл бұрын
@@SuperBhavanishankar hello..
@applesweet55
@applesweet55 2 жыл бұрын
His calmness eases my physics anxiety
@mukeshwathore944
@mukeshwathore944 2 жыл бұрын
Amazing explaination 🔥
@nikhilgarg2929
@nikhilgarg2929 3 жыл бұрын
2:32 u will be able to see difraction
@jerichobauner5914
@jerichobauner5914 3 жыл бұрын
THANK YOU! FOR THIS! :))
@nikhilgarg2929
@nikhilgarg2929 3 жыл бұрын
@@jerichobauner5914wlc
@jerichobauner5914
@jerichobauner5914 3 жыл бұрын
@@nikhilgarg2929 E
@ag887s
@ag887s 9 ай бұрын
Thank you for the explanation ❤
@suchismitabehera5783
@suchismitabehera5783 Жыл бұрын
Thank you so much sir.a great respect to you sir.explain the experiment nicely.
@genmckenna3718
@genmckenna3718 Жыл бұрын
brilliant ..beautifully explain..thank you
@-MikaelaWuisan
@-MikaelaWuisan 2 жыл бұрын
Thank you Sir. It really helped me understand:) Have a good day..
@odal6770
@odal6770 3 жыл бұрын
What would happen if you brought the wire very close to the screen? Would we then see a shadow of the wire?
@syedhasnainahmed9097
@syedhasnainahmed9097 Жыл бұрын
Excellent 👌 Without double slit or diffraction grating
@shadowmonarch8304
@shadowmonarch8304 3 жыл бұрын
This is amazing!
@odal6770
@odal6770 3 жыл бұрын
@Michael Podesta I wonder what one would see if one replaced the screen with a mirror? The circular spot of the laser and the wire? Or the same pattern as with the screen?
@navneetkr.1192
@navneetkr.1192 Жыл бұрын
Thnx, it was more helpful than one may think.😁
@gijoraj623
@gijoraj623 2 жыл бұрын
Wonderful wonderful explanation
@ARCSTREAMS
@ARCSTREAMS 3 жыл бұрын
ok i understand that constructive interference creates a double amplitude thus brighter light is that correct? and destructive creates no light as the throughs cancel but what about when there are different semi constructive or semi destructive phases 1/4, 1/2 etc where do these appear? are they the bands of light that are less bright and why are these happening further to the sides away from the middle? the same constructive patterns happen away from centre as well but why are those less bright though? also if we have a collimated beam of white light will there still be refraction and interference only it wont be creating fringes because there is a jungle of different light frequencies ? if so how come they still cast a near perfect shadow of whatever you put in front of this beam for quite a long distance before it blurs of fades away?
@mahirhasan9212
@mahirhasan9212 3 жыл бұрын
This is awesome 💚
@jaansayyed8632
@jaansayyed8632 3 жыл бұрын
You really deserve more likes 👏👏
@saritapal-dk4lg
@saritapal-dk4lg Жыл бұрын
Simply explained👌👌👌
@rakesharora7714
@rakesharora7714 8 ай бұрын
Thanks a lot
@sandhya41a5
@sandhya41a5 2 жыл бұрын
Thank you so much sir ❣
@sharad7340
@sharad7340 4 жыл бұрын
Thanks my physics teacher used it for teaching
@ecwg8512
@ecwg8512 4 жыл бұрын
Dr. Chan rise up
@theVO1D31
@theVO1D31 Жыл бұрын
When you are truly in love with physics, you speak like this ⬆
@bhigurammahato7228
@bhigurammahato7228 2 жыл бұрын
Im looking for this Explaination
@fikirbirhanu5983
@fikirbirhanu5983 3 жыл бұрын
thank a lot
@ritazaghar8304
@ritazaghar8304 2 жыл бұрын
est ce que vous pouvez faire la traduction en francais
@daydreams9113
@daydreams9113 3 жыл бұрын
"For teachers" *me watching for fun* ;-;
@jeenasubedi22
@jeenasubedi22 Жыл бұрын
Is this possible in normal room? Or need a dark room?
@Rohitsingh-dg1oj
@Rohitsingh-dg1oj 5 жыл бұрын
Sir what will happen if we project 2 laser together Will it show interference
@maxheadrom3088
@maxheadrom3088 4 жыл бұрын
Well, there's interference but it's likely not visible because I don't think you can guarantee that every photon will be produced with a 90 degree phase difference. When the laser goes through the wire it forms something like circular waves on each side of the wire - with the same phase - and it's the interference between these two "sources" that produce the pattern. Huygens, when he proposed the wave nature of light, designed an experiment using a thin hole that should produce circular pattern of interference. A video showing waves in water: kzfaq.info/get/bejne/b82lnKlimbS7oI0.html A simulation of the double slit experiment in water (each side of the wire behaves like on slit): kzfaq.info/get/bejne/Zsmqp6ybltOblWg.html Hole electron diffraction from an Australian school: kzfaq.info/get/bejne/g895dNGprsCvgaM.html
@pham9479
@pham9479 2 жыл бұрын
you can search Michelson interferometer
@odal6770
@odal6770 2 жыл бұрын
@Michael de Podesta did you ever spray the space between the laser and the screen after you had placed the wire? Did you see that light rays were reaching out to the screen, the way the central beam did? I think they do not and that is quite a puzzle. How do the reflections get on the screen if there was no impact other than that of the central beam? I would really appreciate it if you would react to this comment. Even if it is to show that I am completely wrong. If I could I would build the same setup as yours, but I am not very handy I'm afraid.
@razz6475
@razz6475 Жыл бұрын
Woww.. that would be interesting to explore. Thanks.
@odal6770
@odal6770 Жыл бұрын
@@razz6475 Please let me know what you find out.
@odal6770
@odal6770 Жыл бұрын
@@razz6475 kzfaq.info/get/bejne/rMWldcRz2sfWdYE.html The beam certainly is not as wide as the pattern on the screen, is it?
@razz6475
@razz6475 Жыл бұрын
@@odal6770 yeah it isn't. The lady tried to explain using the arrows, which almost seems like divergence of electric field from a point source. Anyway really appreciate the comment.
@jamilurrahman6360
@jamilurrahman6360 Жыл бұрын
Wonderful 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻
@mechanicsforigcse524
@mechanicsforigcse524 2 жыл бұрын
very very nice
@bravedelchannel5067
@bravedelchannel5067 2 жыл бұрын
Thank you for explaining. You saved my day.hahahha
@hugohidalgoherencia5241
@hugohidalgoherencia5241 10 ай бұрын
What happens if you do it with 2 wires ?
@delete7316
@delete7316 2 күн бұрын
I would guess that you'd have more pronounced dots with larger spaces between them due to more sources of interference. It would only be very slight and not easily visible to be different. If you want to see what would happen if there were loads of wires, look up diffraction gratings.
@joeplana
@joeplana 4 жыл бұрын
The pattern would disappear if you blocked one side of the divider.. would that be right? And equally if we marked the photons in some way to determine which side they travelled. It is essentially the same as a double slit experiment... or is there a significant difference?
@lovenaturechannel8080
@lovenaturechannel8080 Жыл бұрын
i dont think so where is slit??? single slit or double where is
@robertwilsoniii2048
@robertwilsoniii2048 3 жыл бұрын
This is awesome. It seems super obvious after spraying the lazer beam with water that it is a wave. You can see the oscillating photon partials moving towards the paper. I guess hitting hair causes the photons to scatter and bounce, I assume the same damn thing happens to water particles if you interfere with water waves.
@lepidoptera9337
@lepidoptera9337 2 жыл бұрын
You want to expose the wave nature of light? Look at an oil film on water or press two glass plates against each other (microscope slides will do fine). No laser necessary.
@n4v33nkum4r7
@n4v33nkum4r7 3 жыл бұрын
This is basically Charlie Puth teaching me physics😳😳
@yerragudisivamohanredy8160
@yerragudisivamohanredy8160 Жыл бұрын
Super 😙
@cslloyd1
@cslloyd1 3 жыл бұрын
Feynman says light is not a wave at all, only a particle. He would have used QED and Feynman diagrams to explain this and would say QED is the most precise/correct theory in the history of science. Why do we keep talking about waves?
@lepidoptera9337
@lepidoptera9337 2 жыл бұрын
Because what Feynman means when he talks about particles are actually quanta. Quanta only exist wherever there is an irreversible energy transfer between an electromagnetic field and an external system. The notion of a quantum within the em field itself is unworkable (it leads to the well known problems with physical realism). It is also complete unnecessary. You do have to understand, though, that these details do not matter to Feynman because the formalisms of QED and QFT in general are taking care of this automatically (and so does the Copenhagen interpretation of non-relativistic quantum mechanics). As a theorist who is mostly concerned with predicting high energy physics phenomena he can allow himself to gloss over these details and it does not hurt his ability to make solid physical predictions. If you are more interested in the structure of quantum mechanics than actual physics (like the standard model), then you have to develop a somewhat refined sense for how you want to talk about these things. When you do, however, you will quickly realize that this refinement is mostly cosmetic. It doesn't allow us to make any physical predictions that do not also pop out of Feynman's crude way of talking about these things in the particle language of the high energy physicist. It's pretty much all just icing on the physics cake, if you like.
@DrAnkitJangid
@DrAnkitJangid Жыл бұрын
Ok
@mdshimul1504
@mdshimul1504 3 жыл бұрын
Thank you sir
@mdshimul1504
@mdshimul1504 3 жыл бұрын
🇧🇩
@harshitmishra3622
@harshitmishra3622 3 жыл бұрын
Ha bhai DPS Gr.noida ka kon kon aya hai yaha pe 😂😂😂😂😂
@mayankpunai7093
@mayankpunai7093 2 жыл бұрын
I am a student of FE4 batch any one here from GCI
@anujmalik7887
@anujmalik7887 2 жыл бұрын
I am studying this in my class 12 [India] . Sometimes i feel like i am a scientist xd .
@archanasengar2854
@archanasengar2854 3 жыл бұрын
He looks like Christopher Nolan
@mugdhomugdho3013
@mugdhomugdho3013 Жыл бұрын
The producer is a BENGALI
@cynagye2096
@cynagye2096 3 жыл бұрын
Normally I don't lol
@atangreid4270
@atangreid4270 4 жыл бұрын
Science class has me like 😴
@SuperBhavanishankar
@SuperBhavanishankar 3 жыл бұрын
For me history class is like 😴
@neerajpathak1600
@neerajpathak1600 3 жыл бұрын
India🇮🇳 ❤
@blackbuildinc
@blackbuildinc 8 ай бұрын
Light. Light? Electromagnetic Radiation? Electromagnetic Waves? Light? There is so much more too light than science. If we are light, and everything is light why is it here and where did it come from? Why can it can have a momentum but not have a mass? You need a mass and a direction to create momentum...
@gregoralexander1856
@gregoralexander1856 5 ай бұрын
Although it may be seemingly deceiving that an object needs to have mass to hold momentum, this isn’t the case at relativistic velocities as photons of light have energy in the electromagnetic form and since E=mc^2, energy means mass and therefore momentum
@fititocom
@fititocom 5 ай бұрын
i like to use two tangled hairs to do the same
@jamesanonymous2343
@jamesanonymous2343 Жыл бұрын
CURIOS TO KNOW,,,IF LIGHT IS A WAVE, AS APPOSED TO A PARTICLE, WHAT ARE IT'S (WAVE), CONSTITUENT PARTS ?
@jamesanonymous2343
@jamesanonymous2343 Жыл бұрын
IF YOU'RE INTERESTED IN GETTING TO KNOW HEISENBERG AND HIS THEORY, THIS GUY WILL GET YOU STARTED IN THE RIGHT PLACE,,,AND THE RIGHT DIRECTION ,,,,,,,,,,,,,,,GOOD LUCK ! THANKS,,,,INSTITUTE !
Using a gold-leaf electroscope with zinc plate and ultraviolet light
3:05
Institute of Physics
Рет қаралды 33 М.
I did the double slit experiment at home
15:26
Looking Glass Universe
Рет қаралды 1,9 МЛН
Зачем он туда залез?
00:25
Vlad Samokatchik
Рет қаралды 3,2 МЛН
Spot The Fake Animal For $10,000
00:40
MrBeast
Рет қаралды 139 МЛН
Пранк пошел не по плану…🥲
00:59
Саша Квашеная
Рет қаралды 5 МЛН
Diffraction (Young's Double Slit & Grating) - A-level & GCSE Physics
19:01
Standing Wave Demo: Slinky
3:39
Physics Demos
Рет қаралды 1,3 МЛН
Why Sugar Always Twists Light To The Right - Optical Rotation
18:39
Steve Mould
Рет қаралды 1,3 МЛН
50,000,000x Magnification
23:40
AlphaPhoenix
Рет қаралды 5 МЛН
Can You Capture a Light Wave? Mind-Blowing Wave-Particle Duality Experiment!
11:19
AT&T Archives: Similiarities of Wave Behavior (Bonus Edition)
28:03
AT&T Tech Channel
Рет қаралды 363 М.
Acoustic Standing Waves and the Levitation of Small Objects
4:34
Harvard Natural Sciences Lecture Demonstrations
Рет қаралды 2,7 МЛН
Mechanical circuits: electronics without electricity
19:22
Steve Mould
Рет қаралды 7 МЛН
Cheapest gaming phone? 🤭 #miniphone #smartphone #iphone #fy
0:19
Pockify™
Рет қаралды 4,3 МЛН
$1 vs $100,000 Slow Motion Camera!
0:44
Hafu Go
Рет қаралды 27 МЛН
Rate This Smartphone Cooler Set-up ⭐
0:10
Shakeuptech
Рет қаралды 2,7 МЛН
Самый тонкий смартфон в мире!
0:55
Не шарю!
Рет қаралды 160 М.