Diffraction Demo: Single Slit and Circular Aperture

This is a demonstration of the diffraction pattern produced by a single slit, with slit widths of 0.02 mm, 0.04 mm, 0.08 mm, 0.16 mm producing more and more closely spaced fringes. Also shown are patterns for circular apertures of 0.2 mm and 0.4 mm.
This demonstration was created at Utah State University by Professor Boyd F. Edwards, assisted by James Coburn (demonstration specialist), David Evans (videography), and Rebecca Whitney (closed captions), with support from Jan Sojka, Physics Department Head, and Robert Wagner, Executive Vice Provost and Dean of Academic and Instructional Services.

[@AdityaVenkatesh101]

Excellent video...finally understood what my textbook was talking about...So good thank you very much!

[@Golgi_04]

help me

[@onlystudynodistractions8215]

@@Golgi_04 what happened

[@deploy_leroy]

In a few years this will be in everyone's recommendations. Great Video !

[@milikumari5474]

Thanks a lot sir.. Your demos add so much significance to the texts we read..

[@jashan_iitroorkee]

It is the same as our Physics teacher made us visualize during the class. Thanks for this beautiful video. Love from India !!

[@shifamuhammad7366]

You, sir, are a saint! Your demonstrations are so helpful!!!! Thank you so much!

[@partozohrabi1327]

U cannot possibly imagine how long I've been searching to understand this, thank u so very much.

[@vinodsingh2946]

After four to five videos..which are not able to convince me.... Finally I got this one..... Thank a lot for clearing concept by this experiment

[@Mokun413]

Thank you so much for the demonstration sir!

[@sejalvinodwasule8868]

Wow this is so beautiful!studied it but was never able to visualize

[@JAGGU11]

Yeah 😂😂

[@devanaidu8743]

I am commenting because UA-cam needs it to be recommended

[@chanchalkumarahuja]

Very nicely demonstrated

[@ambujmishra1157]

Great demonstration sir, I never knew before that how does it looks like.. awesome

[@maycodes]

I wish I had seen this before in school, At university I was amazed to see Newton Rings.

[@Viveknannuri]

thanks for the demonstration

[@ht-ve9fe]

Thank you Dr. Edwards.

[@ameerhamza4816]

This need more views

[@JAGGU11]

Integration

[@chandreshkumar2450]

@@JAGGU11 i want his profile pic

[@kricketflyd111]

Thanks for the round one😁

[@Random_Things_On_Youtube]

Thanku sir from india very helpful in visualising diffraction ❤️ very helpful 🙏

[@appledinger1121]

Simply Excellent

[@era7539]

thank you!

[@karimyounan5999]

great .... helped me a lot thanks

[@tssdancelove3319]

very nice...thank u for this video

[@GajananSR]

Sometimes recommendations Rock🤘

[@SATYALIFESTYLESTUDIOS]

Very nice video 📹

[@dhananjaytiwari7124]

Thank you sir it helped me much

[@odal6770]

At 0:56 your hand is right in the path of what should be the part of the beam creating the corresponding reflections, and still, it remains untouched by the beam! No light rays are reaching the screen, except at the center!

[@MikkoRantalainen]

There are no reflections. And the diffraction happens at the slit, not later. I think the Pilot wave theory provides a better explanation for this experiment. If you're not familiar with the Pilot wave theory, try the Veritasium video titled "Is This What Quantum Mechanics Looks Like?"
And note that since all we're seeing around 0:56 in this video is a line so we cannot know if the camera is higher or lower than the plane of the light.

[@odal6770]

@@MikkoRantalainen Interesting, but I must admit that I still have some reservations. One can deduce the height of the light source by the changes on the screen. Besides, the presenter stands next to it at the start of the video.
Concerning the lack of reflections and the diffraction starting at the slit, I wonder what you mean exactly. In my layman's view, either the reflections are created when rays/waves hit the screen, or they can be created at a distance, without any rays/waves touching the screen at the corresponding locations. The latter case is very strange, and i have no satisfactory explanation for it. Of course, if the light rays/waves are reaching the screen at the locations of the different reflections, then the mystery is solved. Concerning your reference to quantum theory, I would much prefer a down to earth explanation. Do you have one?

[@HassaanFareed]

Sir where to get such a perfect slits?? Any link?

[@assassinx2550]

I think u can get that on eBay

[@cm-a-jivheshchoudhari9418]

Make 1 at home

[@peacefulcat3578]

thank you sir

[@jebaaniqa3382]

Thank you sir 😊

[@kimtaehyungthekingofheart5978]

Sir thank you so much 👍👌👌👌

[@nileshpandey4468]

So much helpful

[@Rex2464]

Sir what is the dia of circular aperture ?

[@adarsh3058]

Now I see where the picture came from

[@Oyee_Pranjal]

Thanks sir ......🥰

[@martinsoos]

I liked the bounce of the round aperture. The center moved first and the outside moved in a wave function. Was that from the aperture turning away from perpendicular?

[@seanchu3962]

The experiment setup is not very clear. How was the experiment setup constructed?

[@chibuzordesmond3937]

Is it a single slit or two slits?

[@anushabenny8586]

Why does it have rings when it passes through a circular aperature? Does it interfere with anything like in the slit experiment?

[@arghyadas6978]

It's a diffraction pattern, not an interference pattern. They just show the circular wavefront of the light in this case.

[@anushabenny8586]

@@arghyadas6978 what's circular wavefront?

[@arghyadas6978]

A wavefront is a plane where the particles of the wave are vibrating in the same phase. When this plane is circular in shape, it's called a circular wavefront. Same phase here means nature of movement.

[@arghyadas6978]

Umm actually, it won't be 'circular wavefront'. It would be a 'spherical wavefront' as the wave propagates in three dimensions.

[@priyanshgupta488]

@@arghyadas6978 Yeah.. Circular wavefront doesn't make sense here

[@odal6770]

You get the same circular pattern if you point a laser pen onto a mirror. No slit needed.

[@Differendramovies]

Wow

[@SciD1]

You do realize we are not supposed to get an interference pattern with a single slit, right?

[@edwardlewis1963]

@2:55 ..... ok I now notice your correction added visually.
Anyway, how can these small slits/apertures be made? You are obviously using some sophisticated device but what assurance does the spectator have that you are not just flashing pictures up and telling a made up story?
There's a lot of fluff on youtube about Young's Double Slit experiment, but a double slit interference pattern isn't surprising if a single slit produces a pattern. Puzzling over the double slit result without understanding the single slit result is..... odd.

[@kingofblox2976]

Lol, read a textbook

[@arghyadas6978]

I tried doing this with a divider and using my phone flashlight. I made two holes using a divider one mm apart on an opaque surface. I could only see the circular diffraction pattern. My original intention was to recreate the double slit but I failed to do that. My holes were too big.

[@asinjobi6853]

Dude u should use a monochromatic light source not the white light

[@ankitasrivastava3966]

@@asinjobi6853 exactly

[@assassinx2550]

@@asinjobi6853 I think he can do so by taking a candle and sprinkle some table salt on it

[@noorfalak6341]

Wao

[@sassoahmed9734]

تم الاشتراك ولكن أرجو ترجمة فيديوهاتك للغة العربية الفصحة

[@adarshsingh269]

Billgates in screen..

[@Upendra237]

OMG

[@danielalarge728]

Hi

[@vinitarathore7280]

Why are only indians watching this??

[@me-oniichan]

Becuz we r the only one who are really interested in it

[@savitrinaik5986]

@@me-oniichan 😁😄😆that's true

[@maycodes]

Becuase we are fed up with rot learning , just calculating.

[@savitrinaik5986]

@@maycodes yes true

[@jebaaniqa3382]

Becoz we don't have this practical in our school n the instruments 🙃

[@greetingsearthlingsmynamei6393]

Light is an alternating current. It's obvious when pointed through the round hole. Light hits the screen, reflects back to the hole, back to the screen but more diffuse,..... rinse and repeat.
Make sure you use a non reflective surface on the back side of your slit.
Your experiment is similar to looking in a mirror pointed back at a mirror. Are there really 50 of you leaning one direction or the other? No, it's all reflections and your controlling them.