Diffraction: Why Does It Happen? (Physics Explained for Beginners)

[@inejunta6569]

I love it when you just find a random video of someone that understands something enough to be able to simplify it

[@JustMoseyinAround]

*Dude, I just read the Huygens' Principle in my textbook like three times... I just grasped it now with your explanation. Thanks a bunch.*

[@fadhilshiddiq2231]

Same its really difficult to understand it through textbook

[@DonnyPUtama]

0:07 "The outbreak shall not be named" 0:16 "In this video ill take.... ***** outbreak" Well thats only 9 seconds..

[@kayrstar8965]

It sounds Voldemortish

[@imanabu5862]

@@kayrstar8965 exactly!

[@ankanbasak1488]

Was about to make this comment…😂

[@upandatom]

Great channel you have a talent for explaining :)

[@mrp9404]

so true

[@torpezaincreible8692]

You too! I love your channel

[@zarinawillows2347]

Your channel is awesome too.

[@michaeldesanta0047]

SIMP

[@tonystark6997]

Wow reply from another great channel..!!

[@ganeshmurmu2338]

Wow man, you have got some serious skills of explaining, This is what everyone wants from a teacher that is explaining everything from scratch, not expecting from the student to have any knowledge, please never discontinue this

[@nellypetrov4770]

My goodness thank you so much for making this. Trying to explain Huygen's construction is one of the most painful things I've ever had to teach.

[@alakh2472]

Right....most hard thing for BANGLADESHI students ever

[@study877]

@@alakh2472 are Bangladeshi student's brains fried or something? why would Huygen's wave principle be the one that's so hard for them to understand

[@jagannathhirave]

This man is obnoxiously underrated. He explained diffraction in the most understandable way. Could never have understood this without ya. Thanks man ✊

[@TruthWillSF]

currently IAM doing bsc in physics from KZbin university. thank you

[@shri2820]

same its fun knowing all this when u in highschool XD

[@TruthWillSF]

@@shri2820 😁👍

[@chinmaykrishna6485]

@@shri2820 It's more fun when you know it in middle school.

[@theoenomelphilosopher8687]

@@chinmaykrishna6485 too bad i totally hated physics in middle school

[@chinmaykrishna6485]

@@theoenomelphilosopher8687 Actually teachers make physics boring.

[@KOgundeji]

I've been looking everywhere all night for an explanation of diffraction through a slit and glad I didn't give up! So many videos state that diffraction just exists and don't explain why and it drove me CRAZY. Thank you so much

[@MildSatire]

10:36 everything just clicked for me. I love beautiful “aha” moments like this. Thank you!

[@rehandolamulla7145]

FInal someone that explains the theory instead of just saying this is how it should be.MUCH APPRECIATION

[@blackmamba779]

As a person who always need to visualize the ideas in order to being able to work with them I am really grateful for your explanation

[@andrescobark]

Ok, I've watched this video several times since it came out, I think I finally got it! Nice way to put this whole diffraction concept, thanks!

[@GenoGENOVA]

Yes me too and still, yet if I get what is wonderfully said in this Video it will not answer your question in different scenarios like if you imagine with different wave lengths the Arc of diffraction is different : Bigger wavelengths tend to have a complete arc of diffraction while smaller wavelengths get a very small arc. In this video it explains it : kzbin.info/www/bejne/eHmTf5mMirmKfZY

[@huwaiidahayaat]

i am not even a high school student. I recently passed 9th grade but still was able to understand. P.S : I am good but not an excellent student in this subject. THANKS A BUNCHHHHH

[@selinasawan6895]

Thank you so much! I’ve just started a degree in diagnostic radiography (after a long time out of education) and have little physics background. This has been a really helpful resource to cement my learning. You have a great clear way of explaining, making this less complicated. Thanks again!😃

[@asmitaJ]

This was awesome, I can't imagine how much work must go into this.

[@muskaan5586]

You made the concept so easy....i can't believe that this 15 minutes video made me understand the whole topic which I was trying from last 5 hours.. Thank you its really gonna help me in my seminar.

[@samumaenpaa2106]

KZbinrs like you save me from the boring teacher curse. Thank you for keeping my passion for physics alive :D

[@ΓιάννηςΝάνης-ξ5π]

Biggest Physics brain of KZbin. Thank you for existing

[@prettypirate]

Exceptional explanation 👏👏

[@petervince8346]

A talented man gliding over complex subjects - enjoyable.

[@ramsesll2841]

Your simplistic way of describing complex things makes me dig deep into physics even if I don't belong to the field! Can you explain (derive) Einstein's field equations as well?

[@overlord3481]

shut up

[@ramsesll2841]

@@overlord3481 Calm down kiddo, Calm down

[@overlord3481]

@@ramsesll2841 fight me. then i'll show you which field you truly belong in...

[@avinashsparrow2911]

@@overlord3481 lmao LOL

[@justalazyguy.0_0]

@@overlord3481" fight me" We're not that advanced yet

[@MohdIrfanZ7]

This is the best explanation of diffraction I have ever seen.Thanks

[@josemanuelperezzegarra2049]

Soon I'm taking the Optics exam from my physics degree and it has been really clarifying. Thank you very much Parth. Subscribed ;)

[@aaradhyaneti320]

This is exactly what I was looking for, LITERALLY. This world needs more explanations like this. Generally, what we learn in school only covers how things are, but not WHY they are the way they are. I know that it's not always easy to understand the Whys and sometimes it's best to be understood once we have command over the basic concepts, which we'll eventually build, but I still can't help but explore. Videos like this show that it's still possible to have a basic conceptual understanding of these things. Most explanations online just throw a bunch of complicated words to sound smart, but don't have much substance. This video was AMAZING though. It PERFECTLY explained everything coherently and the visuals were great! Now, THIS is how explanations are supposed to be. I'm going to go binge watch all your videos now😭 Also random, but I want to be doing the same thing in the future. I want to explain all these fascinating concepts from scratch in a way that makes people feel "Aha! so that's how it works". That feeling of understanding something makes me tear up (tears of joy ofc)

[@littlefanbigfan4122]

wow, what a nice channel! You explained everything in such a clean, clear and to-the-point way! Thumb up and subscribed! Would you explain polarization?

[@siddhanth124]

It's was extremely amazing I never get while I was reading it many times but you made so much for me to understand itt❤️

[@geomanisgod]

Scattering theory refers "secondary wave" as "secondary source", and it is possible to be higher order, third, fourth and so on. Very nice explanation, you are genius.

[@anahitaabdollahi4584]

This was one the best educational videos I have ever seen! Thank you

[@weekendresearcher]

One of the best of all your uploads

[@alexfontaine6233]

you should get an award for this explanation. Thanks!

[@sukursukur3617]

As soon as i saw the title, i subscribed. I love first principle questioning

[@edonave]

The most clear explaination about this topic. Great work and thank you!

[@venkataramanarishikesan8104]

Hey Parth! I really love the way you make things seem simple! Would love to see your perspectives on reciprocal space soon! Take care :)

[@tinkeringlabplus2516]

The best description I have ever seen. Simply great.👍

[@aniketsatpathy1532]

Your way of explaining is simply magic ✨ 👍

[@nusaibakhan4323]

Never got such simple explanation from anyone Thanks

[@rohitkhadka2001]

Amazing video. I can't get better than this. Explained every concepts simply. Support from a Nepali

[@1420channel]

The best explanation!

[@berserker4539]

Thank god i found your video. U just taught wave optics in 15 min. Thank you and may god bless you.

[@fahmidaafreen9855]

This video is just so amazinggggg!!! I have fallen in love with waves...tysm!

[@zakirreshi6737]

Finally you helped me in understanding ...Huygens principles and why light bends at corners... thanks very much

[@oisheebanerjee2793]

Hey Parth! Amazing video, as always :) I have a fundamental question - Hyugen makes the basic assumption that each point on the peak is a secondary wave source. Considering the fact that the rest of the principle relies on this, on what basis did he make this assumption? What is its validity?

[@gaudiumlex9929]

Because intuition + it is consistent geometrically. Divide a circle's circumference into infinite points and draw smaller circles with each of those points as new centers. Now, draw tangents to each of those small circles, what you will get is bigger circle that is concentric and larger to the one we started with. This is nothing but a new way of drawing concentric circles and waves propagate in concentric circles in a medium (regular observation). So, in this way treating each point on a wave front (circle) as secondary sources of new wavelets is consistent mathematically. In simple terms, a good thing to bet on.

[@PassingThrough1972]

I had the same thought. I think it begs the question. What really is the wave?

[@marspalk7611]

​@@PassingThrough1972disturbance propagating in transverse direction or in longitudinal direction.

[@theweebandrea6008]

Wow, thank you so much. I am just learning about the huygens-frenell principle so this was very usefull!

The best description I saw, thanks my friend

[@samiajesinahona8393]

What an explanation Parth!

[@georgeflemetakis8496]

You are the definition of Physics Teacher! Thank you so much!

[@sumitkumar-el3kc]

So glad I found this channel ❤️❤️❤️.

[@bookworm3910]

Congratulation Parth for 100k subscribers ! Big day for you and for us who constantly look forward for your videos 😊

[@sachinthafernando6611]

You should be my physics teacher. You'r the definition of amazing at explaining things.

[@outsideworld76]

Great video, I wasn't aware of this explanation for the explanation of diffraction. Food for thought 😁

[@OneWithStars]

A wonderful and clear explanation! Thank you!

[@JahangirAlom-gj8je]

It was awesome 👍 physics can be described without maths, u've just proved it.

[@sumant9120]

I'm in 10th Class and can understand everything. Pease keep inspiring students like ous and keep up the good work. Hats off to your explanation. 👍🏻👍🏻👍🏻

[@prarthanabidare1678]

It's amazing the way you have made these things so simple! Thank you !

[@ayooluwakolawole]

This was extremely well done, and very comprehensible. Thank you so much!

[@adbanerjee9888]

Fantastic stuff Parth.

[@esharahman4648]

LOVED the explanation!

[@ThefamousZozo]

Hello Parth G, I have a burning question concerning diffraction: After passing an obstacle, a wave also propagates into the shadow behind that obstacle. Imagine the obstacle as a wall. What determines the angle between the wall and the outermost waves? Why does it seem to be smaller for light but bigger for sound (you can not really look around corners, that you clearly hear around)? Now imagine another wall closing in creating a slit of decreasing width. As far as I have understood (which is not very far) a smaller slit would decrease the angle between the wall and the outermost wavefront, until the slit is as wide as the wavelength and the wave emerging from the slit can be treated as a point source of that wave. Does that mean with a very small slit you can look around corners? If this is true, why does that angle change during the decrease of slit wideness? How does the wave, formerly propagating around a corner "know" that the other wall is closing in? Thank you for this great informational video! Greetings Zozo

[@rajeevsharma3162]

just amazing👌best video on diffraction

[@Cans9594]

U da best. The way u teach is exceptional. Not all heros wear cap.

[@davidthomas5077]

I love the setup behind you!

[@ccsnd77]

Great explanation! Well done!

[@madhdamm2888]

You explained it very well.Taught every corner of it very clearly.....I subscribed you. Thanks a lot..

[@naveensagar2408]

CLEAR CUT EXPLANATION SIR! THANKS A LOT.

[@MuhammadAhmad096]

Question: What happens at the ends of the waves, where there is no oncoming wave to interfere? Because if there's no interference there then diffraction should happen everywhere during propagation, not only at slits.

[@jacksonzheng3103]

In this model, the ends of the wave are assumed to be a cutout of a bigger picture of the actual wave. the actual wave would be round like a wifi symbol but this model describes what happens at a point or a small section of the wave similar to the tangent of a circle. Hopes that makes a bit more sense. Also you are right in terms of the fact that wave do spread out in nature but the term diffraction is only used to describe the further spreading out of waves as it passes through a slit or opening of some kind.

[@aarnavsood28]

i had the same question, and @Jackson Zheng's answer explained it to me, was hoping to find someone with this doubt in the comments as I did not know how to articulate it :P

[@vojtareichl]

@@aarnavsood28 yes, I've had the same problem xD

[@Bob-my6jy]

@@jacksonzheng3103 thank you very much, I do think it would be better to add that to the main explanation

[@ec6093]

You made it easy to understand, thanks!

[@IliasManCity]

Very good explanation and especially the visualization)

[@live2discover639]

Awesome bro, great way to spread your knowledge, I have understood now

[@monalisamallick9426]

very nice explanation. thanks for the video. Great work, keep going!

[@johnjordan3552]

Thank you I am at high school and this magical phenomenon was buggin at me for months now!

[@johnjordan3552]

p.s. I watched the whole video, and now am convinced whole physics is a sham. Hooray maths, damn you natural so called laws. Hopefully Wolframalpha's so called fundamental theory don't turn out to be a sham too, so we can have some definitive stuff

[@madhurikumari7655]

After seeing your video now I am able to understand diffraction after 7 years

[@bearme1160]

Great video but what confuses me is why the waves before the slit don’t propagate outwards as well like the ones after the slit because according to the diagram there is no wave to interfere with the highest and lowest point of the planar waves to stop them from doing so

[@lucyblake8184]

such a good explanation! so helpful:)

[@KatDiedAgain]

Wow, thank you so much. I don't learn well with textbooks, and this really helped me understand.

[@yatinsai7960]

Bro you got some serious talent 🙏🙏🙏 Too good explanation

[@Ummmoks]

Thank you for this explanation. I was wondering though, why the wave bends but then it seems as if it starts to be straight again

[@coltonboxell1960]

This was so concise!

[@stvp68]

Nicely done-very clear!

[@harrypounds456]

dude your channel is gonna blow up

[@danushtv1807]

I am new to this channel and love this kind of videos hope you will be making more such videos I am in grade 12 so this kind of videos really helps enhance my understanding of physics. Thanks a lot😁😁

[@pigman6954]

that huygens-fresnel model is pretty cool but i still have two problems: 1. if we are assuming that waves propagate because of those smaller secondary waves, how do those secondary waves propagate? with nothing to move them forward there is nothing to bring them to the spot where the new peak would be 2. after the light wave passed through the small slit, we saw that a "shorter" wave made it through while the rest was absorbed. it travelled outwards because the secondary waves on the edges had nothing on the outside so therefore the just propagated outwards, creating that bending effect. why didn't the secondary waves on the edges of the initial plane wave also propagate outwards, thus bending the light? in other words, how come the light needed to pass through the opening to begin bending; with that model it seemed to me that it would logically bend in that way from the beginning, regardless of the presence of a slit

[@niil0y]

Glad youtube helped me finding you. Hearts.

[@karrarx2084]

Amazing video as always. I understood most of it but what confused me was why in the primary waves (in the diagram you drew they are the lines) do not have bend towards their ends as well. Moreover, there are other points of constructive interference (of the secondary waves), which also form a line- what do they represent?

[@En_theo]

Also, the first wave after the slit is not round but flat with round borders... I wonder if we get that same shape in reality too ?

[@arvindupadhye6172]

Well, the primary plane waves actually stretch infinitely on either sides.. only the part that hits near the slit is shown in the diagram.

[@En_theo]

@@arvindupadhye6172 But do we obtain that shape in reality just near the slit ? Or is too hard to measure precisely ?

[@OMRANKHAN-pl4sy]

this man is a god send

[@nimishdudhe4449]

Great Channel Buddy💜

[@malayalamkingston]

Awesome explanation Sir.Keep up your great work.Thank you.

[@MayurBirari]

Great video. Can you do a video explaining "Why" larger wavelengths diffract more compared to smaller ones? I know there is a complex explanation in QED, but I haven't seen a simple explanation that is easy to visualize. Thank you

[@justalazyguy.0_0]

Sorry i am year late But the you can think it like this larger wavelength are fat and smaller wavelength are thin and for the thin guy its easier to pass through slit and diffract less at the edges

[@nm5641]

You made an awesome explanation. Loved it

[@evanparshall1323]

Wow what a fantastic explanation!

[@hongcheechong4767]

Awesome video, wonderful explanation

[@johnoliver1207]

Hello, Parth! I’m in search of an answer regarding a phenomenon I’ve noticed for years. I discovered your channel and liked the way you explained things, but haven’t exactly found an answer to my question yet. I was hoping you might be able to help me. Here’s the phenomenon: Stand in a room with a chandelier or any multi-bulbed light fixture and you will notice no individuality in the illumination; it’s just one homogenous glow. The number of bulbs only adds to the brightness. But step out of that room, close the door, leaving a slight crack, and you will see the light falling on the floor before you is not one, solitary shaft but rather the number of beams will match the number of bulbs. Somehow, passing through the sliver of space between the door and frame, causes the light to divide into the quantity of originating sources.

[@somenn.s3977]

Superb,Partha....Carry on....

[@segunlonge3886]

Not a bad explanation. In A'level textbooks I was told to look at what happens to water waves when they pass through a narrow opening (they flank outwards - refract) so I never had issues accepting refraction. Though this is the first time I'm hearing about secondary waves. I was thinking fudge just before you mentioned it; rather how accountants can fudge profits to increase the bottom line.

[@ChannelSRL1]

What about the conservation of momentum? How is momentum created to propagate a wave in the opposite direction?

[@Ottmar555]

kzbin.info/www/bejne/mWqkloOsfampf9E

[@ChannelSRL1]

@@Ottmar555 At MIT do you get extra credit for staying awake for an entire lecture?

[@Simonjose7258]

Light, i.e. photons, have no mass. Massless particles have to travel at the speed of Causality. The speed of electromagnetic radiation is the fastest speed that an electric wave can effect a magnetic wave and in turn effect an electric wave. The opposite magnetic and electric polarities propel each other. Like a water wave that goes up and down due to the forces of gravity and the water particles next to each other, pulling the next one along, the oscillating negative and positive charges along with the changing magnetic polarities of the electromagnetic wave, propagate and propel that wave at the speed of Causality. C, which happens to also be the speed of light! (I'm pretty sure 🤯🤦‍♂️😅)

[@Simonjose7258]

Also, a moving electrical charge will produce a magnetic field.

[@Ottmar555]

@@ChannelSRL1 I dunno. Watch from 47 minutes if you're impatient.

[@RyanJumarPantoja]

thanks for the simple yet detailed explanation of diffraction.. ❤❤❤

[@brendanfan3245]

you are such a talented scientist, and should be much more subscribers。。

[@AbdulMomin-dk8ot]

Kindly, check this! It means the amplitude of wave that is propogating in forward direction is decreasing Even there is no energy loss to surrounding As every point on line, which is acting as source is also producing wave in directions other than forward So the wave that is moving forward has not all the energy

[@YO-tm2fl]

that was pretty cool...helped me visualize the mechanics behind it really well.But i still dont understand why formula for diffraction and interference are different...the fringe sequence is same..still they got reverse odd and even multiple..so if u could make a video about that..it would be really helpful.

[@viviankris9939]

Thanx for the time stamps, really useful