Rainbows - Coronae - Glories - Glass Bow - Great Demos - Rainbow in Lecture Hall Assignments Lecture 22: freepdfhosting.... Solutions Lecture 22: freepdfhosting.... Take-home experiment, Transmission Grating: freepdfhosting....
Пікірлер: 46
@07sanjeewakaru2 жыл бұрын
Wow.... You will never see a science teacher like Prof. Lewin... Hats off dear sir...!!!!
@ianmichael57689 ай бұрын
I have witnessed a hexagonal rainbow. All it took, extreme cold and snow flurries. Absolutely amazing. Like this lecture. Respect.
@jivika26382 жыл бұрын
few time ago when I clicked a photo of a rainbow is date about 17 September 2021. and I check what is primary or secondary its beautiful and it's primary 😁❤. thank you professor for giving us great knowledge!!.😀
@luvinthejazz8 жыл бұрын
Thank you for this great lecture Professor Lewin. Very interesting. I have just one question though: Is a raindrop really spherical? As drops get larger, don't they flatten due to the air drag as they fall?
@lecturesbywalterlewin.they92598 жыл бұрын
+luvinthe jazz Raindrops are not precisely spherical because of air drag and that does have an effect on the geometry. However, that effect, in general, is quite small. I suggest you search the web and find out more about this.
@surendrakverma5552 жыл бұрын
Excellent lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏
@studywithjosh51093 жыл бұрын
Moments ago I captured a few photographs of the 22° Halo around the moon. Is there anyway I can share these with you professor?
@darkomalic59502 жыл бұрын
Hi professor Lewin, Sorry to bother you, but I am doing a school project and I am wondering what is the glass bead size (in microns) that you used in your demo at time stamp 1:11:45 ?
@lecturesbywalterlewin.they92592 жыл бұрын
I do not remember but I believe I mention it in my lecture
@Merilix23 жыл бұрын
Two questions: a) Can the light escaping the raindrop at point B form a rainbow against the direction of the sun? b) How can there be a 3rd rainbow? My father got pictures clearly showing 3 of them (3rd very faint but visible) My guess: some of the light hit two drops in sequence and what i mentioned in question a) applies to one of them.
@lecturesbywalterlewin.they92593 жыл бұрын
how many minutes in the video?
@Merilix23 жыл бұрын
@@lecturesbywalterlewin.they9259 My first question refers to the picture shown 6:24. After a little research I think thats what is called zero order glow formation. No reflection inside the raindrop. Regarding b), this 3rd bow is still a mystery to me. Unfortunally I actually dont have access to the image showing it. As far as i remeber, he was outside of the secondary but with clear separation. However, I still wonder if lightrays passing two raindrops in sequence are bright enough to form visible rainbows at different angles than the two shown here.
@poojaubanshi87824 жыл бұрын
1 Why water droplets doesn't reflect all the light at once? 2 why does it go through internal deflection?
@lecturesbywalterlewin.they92594 жыл бұрын
I cover this in my 8.03 lecture. Watch it kzbin.info/www/bejne/lXWUq2mqZ99kbJo
@meikejune40094 жыл бұрын
I saw all your lectures about rainbows. I can't calculate your glassbow at another glass planet. I can better tell you, what will happen, if you reach there. But you should wear a hat. The glass cristalls will set on it. And on this planet there is a glass castle. And there you will see everything in an always changing colored way. Change is the character of your fantasy glass planet. Walter ❤physics 🌼👍🏻
@rajviswath47064 жыл бұрын
He passed away in January of 2020
@Jirayu.Kaewprateep4 жыл бұрын
Try from underwater to see rainbow then using transparent glass and try again :)
@hiccup3.144 жыл бұрын
Sir, sorry for not keeping my promise of solving problems, It is entirely on my side But I'll cover up for it I have a little question sir, if you could please explain, it would be nice How is the rainbow formed when phone's flashlight is turned on? It is like the one formed due to reflection from droplets( that is, white in the middle, violet on the inside and red on the outside) But what does it refract through air? The glass on top of the flashlight itself? Or do the colours diffract from edges of my phone's camera hole? I also see them formed around street lights I thought that they were formed due to uneven diffraction of colours from the inside surface of glass? Also the size of rainbow also changes, if we're closer to it, it appears larger if we're away from it,it appears smaller? Is that just due to the amount of light reaching my eyes? Like when I am away there is more amount of light hitting my eyes from the sources then the amount hitting when I am close? I do love physics sir, sorry for being lazy. I won't be lazy anymore Love you sir, you are the best physics teacher I have ever seen.
@stargazer76443 жыл бұрын
If you’re talking about color fringes around the edges of bright lights, you’re probably seeing chromatic aberration. This happens in lenses that don’t focus all colors to the same spot. Check out the wiki page.
@mohakjani62208 жыл бұрын
thank you sir
@hseverins7 жыл бұрын
Ongelooflijk ............ Waauw , zo mooi
@lecturesbywalterlewin.they92597 жыл бұрын
:)
@harshal1uplavikar4 жыл бұрын
how polarization is lost after striking with the screen ?
@hseverins4 жыл бұрын
Walter , hoe komt het dat als je een regenboog wilt zien, je met je rug naar de zon moet staan ? En soms richting de zon kijkt met helder weer , en je heel soms een stuk regenboog ziet bij een sluier wolk ? Ik weet dat een halo ijskristallen zijn en die vormen een cirkel rond de zon ☀️..... groetjes Henny
@lecturesbywalterlewin.they92594 жыл бұрын
watch one of my rainbow lectures and you will understand
@meikejune40094 жыл бұрын
The waterdrop experiment is fantastic.
@mohakjani62208 жыл бұрын
sir can there b a rainbow in moon light ?????
@lecturesbywalterlewin.they92598 жыл бұрын
YES en.wikipedia.org/wiki/Moonbow
@philipyip65484 жыл бұрын
Apple daily newspaper
@sachinpatel68446 жыл бұрын
Sir you are standing in front of projecter screen
@lecturesbywalterlewin.they92596 жыл бұрын
:)
@sweetysingh71138 жыл бұрын
at 52:08 why you said "its is not rainbow itself" though you had demonstrate rainbow ? i want to ask one more question and i know its too bad but i cannot get the concept you always said that after reflection from the wall the light is no longer polarised so students cannot use there polariserwhy?
@lecturesbywalterlewin.they92598 жыл бұрын
The demo is produced with 1 water drop. I project on the screen what 1 drop can do. When you look at a rainbow. you see the result of millions of water drops. Watch my lecture again! The light that is dispersed by the one water drop is polarized. I show that using a polarizer in the beam. The students cannot see the polarization using their own linear polarizers as the light that is reflected from the screen in their direction is no longer polarized.
@sweetysingh71138 жыл бұрын
i got your point and also answer of one question. my question is why after reflection from wall" polarised light is not polarised any longer" thanks for reply
@domenicobianchi82 жыл бұрын
Hi Professor, why is that with one eye u see a "better" version?
@lecturesbywalterlewin.they92592 жыл бұрын
with 1 eye you cannot see depth
@domenicobianchi82 жыл бұрын
@@lecturesbywalterlewin.they9259 Thanks for replying, i see. But how does this affect the "rainbow" quality?
@yogeshkumar-zv1ix3 жыл бұрын
sir can the rainbow be seen with the moon light in the light night just after the rain ? because when i went to my home town i saw a beautiful rainbow in circular fashion about the moon .
@lecturesbywalterlewin.they92593 жыл бұрын
what you saw was not a rainbow. A lunar rainbow would be in the opposite direction of the Moon. You saw the 22 degree halo around the Moon, caused by ice crystals in our atmosphere. use google
@yogeshkumar-zv1ix3 жыл бұрын
@@lecturesbywalterlewin.they9259 thank you sir.... this lecture is one of my favourite lecture... only you can explain rainbows in such great details :)
@ronbergeron92988 жыл бұрын
how'd he get 4r-2i
@lecturesbywalterlewin.they92598 жыл бұрын
ask some of your friends
@trilokimaurya14796 жыл бұрын
My goodness
@AThomasKent7 жыл бұрын
Is that Max Tegmark in the audience at 27:51? (Left of the frame, wearing a brown jacket with glasses)
@AThomasKent7 жыл бұрын
I'm pretty sure it is, he arrived at MIT in September of 2004.