Laser Diffraction and Interference

Рет қаралды 254,370

12 жыл бұрын

A laser is directed at an adjustable single slit and then a pinhole and the resulting diffraction patterns can be seen on a screen.
A laser directed at two slits spaced closely next to each other creates an interference pattern within the diffraction pattern. Shining lasers of different wavelength light shows how the wavelength affects the interference and diffraction patterns.

Пікірлер: 63

@conceptionrabe2797 8 жыл бұрын

This is by far the best display of the slit experiments. The only weakness was that the pinhole experiment was only shown with one size pinhole, whereas at the very least they should have shown the control dot without any pinhole.

@AarjavDua 4 жыл бұрын

Thank you for putting this on youtube. It really helped me. Appreciate it.

@johnnoel3823 4 жыл бұрын

If you assume the red laser is He-Ne at 632.8 nm wavelength, you can use the double slit diffraction equation to estimate the wavelength of the orange and green lasers. I got 514 nm for the green laser and 610 nm for orange.

@harshvardhanwagare5663 3 жыл бұрын

Thanks, YT algorithm for this I have to study Wave optics and it helped

@lambda4931 7 жыл бұрын

Wow! MIT is the best. I have watched many of your videos, all excellent. Not a word was spoken, but a ton of info was given and made understandable to the average person. Thank you.

@vibodhj349 5 жыл бұрын

Yes, I can agree to that.

@gursheenks 2 жыл бұрын

This is so so awesome!! Thank you so much for this video!!!

@acykablyatley 4 жыл бұрын

best visual demo I have seen :)

@unknotmiguel 8 жыл бұрын

And what happens when you use a polarized laser in a direction that is perpndicular to the slit

@izzatybadlie 11 жыл бұрын

This is what I'm searching for.. Gracias !

@Tom-sp3gy 2 жыл бұрын

Excellent presentation in the far field scenario. Can you make one for the near field as well please?

@blahblahshutup6024 4 жыл бұрын

Thank You!

@jatinderbanga 8 жыл бұрын

I did this at home with all my lasers. Got the same result it was crazy

@zahraashahin341 4 жыл бұрын

Wow ! It's amazing 👀❤❤

@TheSamruddhi007 10 жыл бұрын

beautiful

@molinobeer 8 жыл бұрын

The single slit seems to show interference pattern to, is that supposed to happen? Why?

@banajadandasena4142 Жыл бұрын

But last one is diffraction, inside the diffraction peak interference pattern are visible, and in interference all dark and white fringes are of equal size. I am confusing with last one.

@eujg84 9 жыл бұрын

When we do a single slit experiment with white light you get a diffraction grating (a colored sprectra is observed simetrically on both sides of a central white band. If white light is composed of waves of different lengths: why the longest (less energy) waves appear always in the periphery whereas shortest (more energy) in the centre?

@yogitshankar6348 4 жыл бұрын

check the result it is directly proportional to wavelength

@richardaubin1951 7 жыл бұрын

Looks like a rising and setting sun!

@yogitshankar6348 4 жыл бұрын

Partially due to the same reason

@growyourself2403 3 жыл бұрын

Thanks a lot, helped me a lot

@eensarindah8840 7 жыл бұрын

it's pretty cool omg😮

@krishnasinghbeniwal670 5 жыл бұрын

very best sir please upload more experiment videos

@ForVisualLearners 11 жыл бұрын

beauty of physix ......in a word osum vid

@sabbirahamed3149 5 жыл бұрын

Now all doubt is gone

@PiNgPoNgLaDd10 10 жыл бұрын

Thanks, that was cool! Did you do this at uni?

@user-jw5ig7vw8k 5 жыл бұрын

_سبحان الله 🍃 _الحمدلله 🏵 _لا اله الا الله 🌹 _الله اكبر 🌻 _استغفر الله 💐 _سبحان الله وبحمده 💘 _سبحان الله العظيم 💟 _اللهم صل وسلم على نبينا محمد وعلى اله وصحبه اجمعين 👑 _الشكر لله 💎

@parasar1980 3 жыл бұрын

bruhh

@Loadinger 3 жыл бұрын

الحمد لله

@mixnewton5157 3 жыл бұрын

لا اله الا الكون سبحانه وتعالى

@ShouryaRohilla 6 жыл бұрын

That is so cool!!

@ziadreda3174 5 жыл бұрын

Awesome !

@GenshinPlayerBR 6 жыл бұрын

Does the green pattern looks shorter in the middle because of the shorter wavelength?

@allallone 6 жыл бұрын

That would be my guess, but I'm no scientist. I just find this stuff fascinating.

@GenshinPlayerBR 6 жыл бұрын

Me neither. I just love learning physics! 😁

@johnnoel3823 4 жыл бұрын

That's exactly right. Look up the double slit interference equation and you'll see that the angle of spread is proportional to the wavelength. This holds true for the single slit as well. The double slit causes the small fringe lines to appear within the single slit envelope.

@nikki.s6456 7 жыл бұрын

this is awesome

@mortirius1 7 жыл бұрын

Im a little confused I thought it was only supposed to have two areas of light intensity when the double slit is observed but here I'm seeing a diffraction pattern thats only supposed to happen when there is no observer.

@danielopez07 6 жыл бұрын

These effects are not really dependent on the observer. When you have two slits there will be interference due to the different path lengths for light coming from each of the slits to the screen. But there will also be diffraction due to the finite size of each slit. The resulting pattern is called interference modulated by diffraction.

@theterralitepodcast8723 6 жыл бұрын

allan J Think of throwing a ball at water, whether it's one or two there well be waves, waves being what you are seing onthe wall. Generally you are seeing waves in the "absence" of solid matter and particles when it hits solid matter. But this lets you see the wave form instead, showing how unpredictable everything we know about science really is.

@SH-rm8br 5 жыл бұрын

Cool! Thanks a lot^^

@tejaswi399 8 жыл бұрын

if slit width increases the diffraction takes place ..can u explain it

@ayushsaxena7770 7 жыл бұрын

teja swi diffraction will take place but it will be less pronounced.remember for a good diffraction pattern we should have slit width equal to wavelengths of light

@sabah8312 6 жыл бұрын

Why intensities are different in double slit expmt??

@coxing6184 5 жыл бұрын

different color light has different wavelength, descending from red to purple as rainbow

@robertwilsoniii2048 2 жыл бұрын

Fuck, I can't understand how this is physically possible. I can't believe all we can do is just set this up turn it on and then just stare at the wall completely dumbfounded. When what's happening is literally happening right in front of our faces with us watching it happen and we still can't comprehend what's happening just by looking at it. I feel so defeated. The answers are all right there and yet we just look at it with no idea.

@snugglepuma8668 10 жыл бұрын

So basically, if I don't check the oil and other fluid levels on my car, change the air filter, and wipe the dust off the valve cover, the particles that make up the engine will turn into a wave form and break down...

@saidmodane4562 4 жыл бұрын

Can i use you video to my student im from morroco

@Loadinger 3 жыл бұрын

C'mon man! It's ok. Why would he mind, tho!

@Udrys999 2 жыл бұрын

So, is the wave-particle duality debunked?

@rainbowunicornfart1232 9 жыл бұрын

Nice has anyone filmed diffraction in real not on the board in the air etc ?

@pameslinkoln 9 жыл бұрын

rainbowunicornfart123 We have a video where diffraction is filmed in the air here: /watch?v=E-3uht9LAhM

@jellyboiii6269 4 жыл бұрын

Can someone pls tell me the difference bw interference and diffraction?

@ningguang7203 3 жыл бұрын

Maybe in this case...diffraction is when on a slit is used and interference is when more than a slit are used..

@sumitbhoi4070 4 жыл бұрын

I thougt this was channnel of Two side gamers

@vicvicvicvic3341 6 жыл бұрын

koul

@Sathea7775 3 жыл бұрын

Khmer kernh like 1

@ajeetblog691 6 жыл бұрын

@zinab9221 Жыл бұрын

يلي جايين من prex يصفو هون

@ahmadsenjo1981 4 жыл бұрын

منو سادس علمي

@Loadinger 3 жыл бұрын

ازاي