Fresnel Equations Part 1: The Boundary Conditions

[@kajarihaldar6061]

was not fiding any motivation to study em. at the end of wasting a lot of time staring at the text book. came across ur video. and ur enthusiastic voice itself motivated me to study let alone the great explanation.. thanx a lot.

[@abdul-hameedotade9790]

Yes you are a Dr of physics you treat physics as if it were your patient. Thanks for this awesome video.

[@payal5454]

Sir!! This is something which made me fall for electromagnetism. "A masterpiece,your pièce de résistance" Thank you!!

[@joeemenaker]

Actually, the part about resistance is a few videos later.

[@pawankharel524]

Thank you for such an amazing video. This video was much effective than hours of lecture

[@CrushOfSiel]

Excellent explanations! I was a bit lost reading Griffith's section on this topic. Crystal clear now. Thank you.

[@alexleviyev]

Great video. Nice dogs. 10/10 would watch again

[@DrPhysicsA]

Thanks. The dogs will be very pleased.

[@alwaysdisputin9930]

16:27 Helpful mnemonic: Evie too, will go up the bottom

[@TheChemmed]

This was very clear and concise. Thank you so much, keep up the good work. Because of people like you I have managed to study physics through the open university, now coming up to end of year exams and I have a conditional offer to study a physics msc at Kings College London. You are changing lives for the better

[@DrPhysicsA]

TheChemmed Thanks. All good wishes for your continued studies.

[@herrzyklon]

You are a great man, Dr Eagle. Thank you for making good quality videos with great explanations. You deserve more subscribers and recognition in my opinion

[@dpcon1994]

Saving me again before my exams... love ya DrPhysics

[@DrPhysicsA]

Hope the exam goes well.

[@StrathTV]

superb piece of master teaching

[@BaronLemon]

Hi Dr! I'm a bit confused by the image at 15:20. You have the first medium up and the second one down, separated by a horizontal interface. But, by the way you drawn the fields, the light waves go in (or out) of the paper's plane (as you mentioned yourself). So, what is actually happening there?

[@juanfa98]

great series mate

[@DrPhysicsA]

I resolve the E field such that the vertical component is perpendicular to the surface and the horizontal component is parallel to the surface.

[@yolanankaine6063]

You are an excellent teacher

[@mostafaahmednasr621]

it is truly facinating how electricity and magnetism work together

[@DeluxeWarPlaya]

The dogs were worth watching the entire video. Thanks for the reward.

[@kamalsoni5750]

Thank you +DrPhysicsA I want to point out a little mistake there @ 08:00 "You said that B field is c (velocity of light) times smaller then E field, But actually its Z (impedance) times smaller than E field".

[@jacobvandijk6525]

For a SUMMARY of this video, just start Part 2. Or watch this 4 minute video: kzbin.info/www/bejne/r5C9ZHV4f8SjlZI

[@DrPhysicsA]

At 33:22 I have derived Bh1 - Bh2 = Epsilon d phi by dt. But d phi by dt =0 so the entire rhs of the equation is zero. Hence Bh1 = Bh2.

[@Aman-tf8bt]

Thank you so much sir it is really a very nice and simple video with a very clear explanation 🙂. Thank you sir....

[@uncleroq]

Thanks. I never understood this. I was so scared of boundary conditions. now they are as fun as logic gates.

[@prabhu4323]

Very helpful video

[@Harpercent]

A past paper exam on Electromagnetic Waves and Optics states this is the boundary condition in words "The tangential components of both E and H should be continuous across the interface. The condition on H is also a condition on dEtan/dx which should be continuous and similarly the condition of E ia a condition on dHtan/dx." What does the second sentence mean?

[@carlosfaurby8363]

I have a question, in the first boundary condition, you chose to move e0 (the permitivity) to the left side of the Maxwell equation. If you hadn't done so, then that term wouldn't be there, and you would end with Ev1=Ev2. In the magnetic field on the other hand (in the fourth boundary condition), you chose to just let e0 be in the right side of the equation, and therefore you could get rid of it. If you had moved it, wouldn't the result be different? Am I overseeing something?

[@carlosfaurby8363]

carlos faurby PS: you have just won a new subscriber

[@debajyotisg]

+carlos faurby I'm not sure, but I think it was done so that you don't lose information about the medium. Given that you are supposed to be integrating over two mediums. Maybe that's why the e_0 was kept safe and replaced by k_e e_0. Not sure though. Anybody?

[@abdelrahmangamalmahdy]

+carlos faurby Same thing I was wondering about. I think, he just skipped a part of the derivation. One should split the integral in two and then divide by epsilon to get the correct results. Try to do it yourself and you'll understand what I mean, however the results that he came up with are still true.

[@chillydawgs]

Near the end of the video, you cancel out the k_m1 and k_m2. I thought that those were two different values because the material is different. Why do you cancel them out?

[@chillydawgs]

Ah, I assume you take them both to be 1. Got it.

[@skincare_tabriz9319]

Thank you very much . Your videos very useful and understandable 😍😍🙇🙇👍👍👍

[@maramhussein3196]

awesome channel

[@sandlertossone1813]

what if there is a surface current in the last boundary equation?

[@tyroneslothdrop9155]

When you shrink 'L' to zero, is that called the 'Plane of Incidence'?

[@axelmagnus]

@ roughly 17 min: the E components are both perpendicular to the direction of movement (z-axis points down, vertical). why then a vertical component? both should be in the same plane as the border between the materials, meaning they dont have any vertical comp??

[@stevenos100]

you're drawing the EMR wave wrong there's a cos=magnetic(current) & sinQ(voltage) phase shift as well as a horizontal cos and vertical sin polarization shift

[@אריקא.-ארכימדס]

integral ?can you please upload videos about the fresnel diffraction

[@amanjhaaj7]

Why are we shrinking L to zero in first derivation?? Please tell me

[@josealejandrovelasquezcast3471]

Please can you activate the subtitles,

[@prakashsatyam]

You sir... are amazing

[@davidsweeney111]

very nicely explained, thank you !

[@umairkhan378]

what is h in eh1

[@porkypine1888]

interesting... think i'll save this one for later

[@chritophergaafele8922]

why are you shrinking the box and ignore the gamma term

[@giraysekerlen5150]

You say you are doing this boundary conditions thing for dielectrics but fresnel equations can also describe the behavior of an electromagnetic wave that goes from air to water and water isn't a dielectric medium what about that?

[@hiankun]

AFAIK, water itself has no free electron. In daily life, water becomes conductive due to resolved material.

[@chenlecong9938]

Hian-Kun Tenn dissolved compound,you meant,like salts

[@gabef9538]

Great litle review.

[@MusicByNumbersUK]

me too! not quite here yet! ;) amazing stuff as usual though! thanks.

[@DrPhysicsA]

I think they call that prescient.

[@hiankun]

I would like the manuscript to be the wallpaper in my study room...

[@2strings]

Fresnel equation plots: kzbin.info/www/bejne/jpqmiWukrK2fg8k

[@jimdogma1537]

How about showing us the mooing alarm clock that also interrupts us in the next video? Lol.

[@Urdatorn]

Pristine explanations!

[@yanemailg]

at last à happy ending

[@abdelrahmangamalmahdy]

Haha do you make these videos on the beach :D

[@YourAverageHater]

Came here for the dogs

[@Kemaaaaa]

22 222th view, cool