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

[@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..!!

[@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

[@TruthWillSF]

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

[@shrivarshini4681]

same its fun knowing all this when u in highschool XD

[@TruthWillSF]

@@shrivarshini4681 😁👍

[@chinmaykrishna6485]

@@shrivarshini4681 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.

[@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

[@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…😂

[@jagannatha.hirave6601]

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

[@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

[@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

[@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!😃

[@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

[@asmitaJ]

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

[@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

[@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.

[@MildSatire]

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

[@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❤️

[@josemanuelperezzegarra2049]

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

[@samumaenpaa2106]

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

[@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.

[@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)

[@JahangirAlom-gj8je]

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

[@Cans9594]

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

[@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.

[@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. 👍🏻👍🏻👍🏻

[@aniketsatpathy1532]

Your way of explaining is simply magic ✨ 👍

[@rohitkhadka2001]

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

[@prettypirate]

Exceptional explanation 👏👏

[@RyanJumarPantoja]

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

[@nusaibakhan4323]

Never got such simple explanation from anyone Thanks

[@user-gs6nd5fy4d]

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

[@berserker4539]

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

[@sumitkumar-el3kc]

So glad I found this channel ❤️❤️❤️.

[@shubhankartiwari5101]

Please explain parallax method I think you can do it far better than other videos on KZbin ✌️

[@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

[@alexfontaine6233]

you should get an award for this explanation. Thanks!

[@OneWithStars]

A wonderful and clear explanation! Thank you!

[@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

[@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

[@user-pr6tc2ym7b]

Biggest Physics brain of KZbin. Thank you for existing

[@edonave]

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

[@zakirreshi6737]

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

[@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?

[@petervince8346]

A talented man gliding over complex subjects - enjoyable.

[@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

[@1420channel]

The best 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

[@sachinthafernando6611]

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

[@sukursukur3617]

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

[@manishchoudhary6404]

Hey Parth, I'm currently in high school but I am taking some undergrad courses in physics. I was wondering if you could do a video deriving keppler's laws of gravitation using calculus.

[@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

[@MohdIrfanZ7]

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

[@madhurikumari7655]

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

[@outsideworld76]

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

[@matildemateus3977]

Thank you so much this helped a lot! I did not understand why the waves bended when passing through a surface and the book did not explain. I do not get why these scolar books do not explain simple but essential things for us to understand the content! it was such a small thing to explain and they do not cover it and for what?.. Anyway, thanks again for the explanation, it was really helpful and i am happy that i understand this now. Physics is beautiful when you understand it and when someone explains it well

[@brendanfan3245]

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

[@anahitaabdollahi4584]

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

[@SidneyPratt]

Thanks, makes it somewhat clearer.

[@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😁😁

[@OMRANKHAN-pl4sy]

this man is a god send

[@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.

[@ethanmoyo4890]

I liked,jus because you have timestamps And because the video was super helpful,but the moment I saw timestamps I liked

[@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.

[@georgeflemetakis8496]

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

[@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

[@niil0y]

Glad youtube helped me finding you. Hearts.

[@yeastinchampagne440]

Hey parth g,here are some more thinghs(ExoTic topics👿);- .Emergence .The new discovery on breaking of t symmetry by 3 object sys and chaos theory .Schrödinger probabilistic wave and heinsenberg up together(Copenhagen interpretation too in maybe a new quantum series.) .quantum field theory .delayed quantum choice exp. LAST 2 ARE MY BIGGEST NEED. (Just put some on your to do list.) Bye,take care.

[@ilaripeltonen4330]

This sounds good.

[@yeastinchampagne440]

@@ilaripeltonen4330 he hasn't reacted though.

[@ilaripeltonen4330]

@@yeastinchampagne440 tru

[@ParthGChannel]

Thanks for watching, and for your suggestions!

[@ilaripeltonen4330]

@@ParthGChannel the master himself has descended among us mortals.

[@fahmidaafreen9855]

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

[@IliasManCity]

Very good explanation and especially the visualization)

[@samiajesinahona8393]

What an explanation Parth!

[@ayooluwakolawole]

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

[@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 :)

[@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 ?

[@hqs9585]

Excellent lecture! This is from a High Energy physicist

[@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.

[@esharahman4648]

LOVED the explanation!

[@ec6093]

You made it easy to understand, thanks!

[@Krankify]

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

[@harshapincha7485]

Thanks for the great visualisation

[@tinkeringlabplus2516]

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

[@boyaolyu381]

Great explanation, thank you very much.

[@zahoordar4403]

I am studying in class 10th but u explane itin that way that I understood all about this thanks

[@manostsili7376]

Oh my god you are so talented and genius!

[@harithrarajarajan4465]

QUESTION/DOUBT???:Hey parth , you explanation is truly amazing, and please reply to this comment, In a plane wavefront (before diffraction) even at the edges also , the secondary wave does not or will not have a another secondary wave to interfere?!! Then we must get something curvy ? Am I right ...idk🤔

[@prarthanabidare1678]

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

[@coltonboxell1960]

This was so concise!

[@shahadab6294]

Thank you! amazingly explained.

[@hongcheechong4767]

Awesome video, wonderful explanation

[@RJ-ek2lj]

Hi Parth, I liked your lucid explanation and all of your videos are really enriching. Can you do a video explaining Einstein’s Field equation? I’ll be waiting for a positive reply. Take care.

[@ebineshs]

Truely helps for better understanding. Wishes Parth G. Can you present one video on MTF in optical systems.

[@naveensagar2408]

CLEAR CUT EXPLANATION SIR! THANKS A LOT.

[@annego3656]

talent for explaining

[@adbanerjee9888]

Fantastic stuff Parth.

[@olemllersrensen335]

Hej Parth, thanks for your video on Huygens/Fresnell and Young etc.etc.This is very god indeed. I am an 80 years old guy, just vent on pension, and is now working with acoustics. I have just one question: What is the criterium for distance versus wavelength for point-sources to form a planewave ? (Something including infinite is not useful in practice)

[@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?

[@Simonsays7258]

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 🤯🤦‍♂️😅)

[@Simonsays7258]

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

[@Ottmar555]

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

[@lanaalabbasi5315]

Thank you! This video helped me a lot with my studies. Could you explain ladder operators and how to preform them on the harmonic oscillator?

[@bookworm3910]

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

[@heshangallage5967]

Great explanation. Thankyou very much...!!!!

[@mryan2010]

Your explanations are great.

[@madhdamm2888]

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