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**Click "SHOW MORE" For Links**
Ray Optics Simulator (0:52)
phydemo.app/ray-optics/simula...
Sixty Symbols Video (1:45)
• Why is glass transparent?
Vsauce3 Video (2:16)
• Can You See Me?
PHET Light Bending (2:51)
phet.colorado.edu/sims/html/b...
Zoom (3:54)
imaging.nikon.com/lineup/lens...
Seeing Through Selenite (5:12)
• Seeing Through Selenite
Depth of Field (5:35)
dofsimulator.net/en/
F-stop (6:00)
en.wikipedia.org/wiki/F-number
Virtual Eye (6:48)
www.jnjvisionpro.com/learning...
**Learn More About Lenses**
Understanding aperture
photographylife.com/what-is-a...
Animal Eyes
iteota.com/experience/the-food...
Focal Length
www.shutterbug.com/content/ch...
Convex and Concave
ophysics.com/l12.html
Refraction
www.physicsclassroom.com/Phys...
Optics
www.synopsys.com/optical-solu...
**CREDITS**
Hosted by
Jake Roper
Written and Edited by
Jack Merline
VFX by
Eric Langlay
( / ericlanglay )
Music by Jake Chudnow
( / jakechudnow )
**VSAUCE LINKS**
Vsauce1: / vsauce1
Vsauce2: / vsauce2
Vsauce3: / vsauce3
Slight correction: The focal length is actually the distance between the center of a lens and its focus plane. Check out this website for more info: www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-focal-length Thanks to those in the comments who pointed this out!
Sorry for trying to correct You. Your Answer would be right for a single thin convex lens. But as a camera lens uses multiple thick lenses, it get's more comlicated. Then the principal planes, from which You would measure the focal length, might not even be within the actual lens body. Otherwise all tele lenses would be really a struggle to carry with You. en.wikipedia.org/wiki/Focal_length
Thanks for adding this correction. It didn't make sense that a 70-200mm lens that doesn't extend when zoomed could fit that definition.
Apart from replacing center of the lens with focal point you also have to replace focus plane (first with focal plane and then) with sensor/film. The focal plane is the virtual plane where objects you take a photo of are in perfect focus. That means if you focus on an object that is 10m away and in the center of the image then you would have a focal length of 10m with your correction. A lens with a focal length of 10m is probably more something for an Astronomer than for a photographer.
As an optical engineering major who aspires to design camera lenses, this is still a gross oversimplification. I would really enjoy talking more about this though, since it's kind of my thing :)
why do i feel like i’ve seen this comment before?
can you imagine the vsauce bois with contact lenses instead of glasses because I can't
Mad Soldier something seems... familiar...
Scout's Dust *imagines vsauce without glasses* ... ... dad ?
@@scoutsdust3936 Or does it?
put on your mind lens
Pretty sure Jake wears contacts. Or he did a lot more often in older videos. In fact, I didn't know he had glasses until the past few years
Your beauty f-stops my heart.
thanks
peepe poopoo
jake you're going mad
Cringe.
Wow I'm technically early to this comment, so uh, hi anyone seeing this
God I love jake, he makes it seem like he is talking to you and only you lmao
GmdJax OW he’s annoying
@@colewomack4688 how
When I don’t see Michael I don’t watch the video lol
Interestingly, with the eye, the lens actually only does about 20% of the refracting, the rest of it is done by the cornea at the front. That'sis why laser eye surgery modifies the cornea, rather than the lens
Wow hi matt
Very interesting. I didn't know that.
hellOOOOo matt!!!
Optometrist here, and nope, laser surgery in the cornea is possible because the cornea has no vascular connections, so it has regenerative mother cells to fix it up quickly. There are other problems that can be solved through cornea surgery not necessarily by laser, thanks to the regeneration possible in the cornea
If this wasn't the case we would be treating patients with contact lenses and protein treatments along with ophthalmologists for corneal problems
Optical DONGS was my nickname in highschool.
Nice
Bruh why you everywhere
Is that gmm?
+fdmy You don't know? he was Justin Y before Justin Y
@@Daapse is that true?
This video made my eye lenses to expand but it would have made my *DONG* to expand too if it was a Vsauce1 video.
This title has just made me imagine the "Aliens" meme but saying "Lenses" It made me happy 😂
haha!
Nice
1:18 Why is there just random footage of a chair while some guy narrates?
Kra Z Kapin 🔍🤔🐢, very witty 😉
I'm not there yet. Is this a camo joke?
Nah it wasn't. All clear lads.
@Finaly Craig No you were right it was a camo joke. You saw right through him!
this is next level puns dudes. look out future, here we come.
*_Inquisitive little turtle_*
r/beetlejuicing
Yeah that's... that's the joke
Thank you for showing me this channel
@@x_x5009 I watched the 2 latest videos and almost died but that's a good thing
Multi Gaming I love that channel, it's why it's depressing the KZhead algorithm hates channels like his, I haven't watched a video in months as a result.
I've never been so happy to be called an inquisitive little turtle
Jake: You can’t see through me X-Rays: that’s where you’re wrong kiddo
"Damn it X-Rays... _BE COOL_ *
Awesome video as always! Love when the DONG videos are also informative just like a regular vsauce video!
so all of the vsauces have glasses now
Because they're all merging into the same single entity. It's just the Vsauce way!
When you finish watching Rick and Morty then you evolve to Vsauce
Are you really smart now?
Dude.... You could have posted this to your vSauce 3 channel and I would have never considered it out of place! This was by far one of the most fascinating episodes you've done my dude. Thanks for the awesome content Jake.
Light speed is constant in ANY medium, not just a vacuum. It is just slower than "light speed" (300 million meters per sec) in other mediums with higher refraction indices. This is because of the interference of the EM field of the atoms that make up the medium. Even though transparent medium's atoms do not absorb photos, they do slow down the light with their electromagnetic field, basically "stealing" some of the forward momentum of light and transferring it into sideways motion of the EM field of the light ray. Similar to you slow down if you are running on a hard floor and then step onto a soft surface or how a slalom skier goes down a mountain slower than they would if they just went down the hill in a straight path.
Lenses seam to be really underrated in a perspective of technology, I assume because they are used so much in every day life E.G smart phones etc. I’ve always known how complicated they are, but you’ve just shown me how and why they are, Great video.
I was just researching regarding this the other day! Thanks for all the dongs guys! appreciate it a lot
I can actually defocus the lens of my eye, it's like switching from auto focus to manual focus and by doing so i'll make everything blurry.
Wow, this is crazy. Light and lenses, bending, absorbing, just crazy.
As far as I've learned, light speed is constant regardless of vacuum. It only seems to slow down when passing through certain mediums because it gets deflected by the atoms, which causes the light to take a more convoluted path through the object, and therefore appears to be slowed.
2:53 I thought that the speed of light IS constant always and that when it only appears to slow down when passing through different mediums because they cause the light to refract- forcing it to take an indirect path outwards. A little bit like how driving to any destination would be quicker if there was a straight line path from your starting point to your ending point but the time is extended, not because your speed changes, but because you have to make turns to stay on the road.
A pinhole is far from optimally sharp because of diffraction! The aperture can change the blur of the background, but also the focal length and the distance between the lens and the subject, and between the subject and the background. BTW, the depth of field isn't the same as blackground blur. A 50mm f/2 lens and a 100mm f/2 lens give the same depth of field if the 100mm is at twice the distance of the 50mm (same dimensional view), but the background with the 100mm is blurrier.
a crazy invention, yes.. but one of the more probable ones at the same time.. from the beginning of their time people could see water drops hanging from leaves and branches.. and many will have looked through thos droplets and see the optical effect.. :-) great vid.. as usual. :-)
2:24 In german, lentils and lenses share their name: Linse (Plural: Linsen)
Light moves "slower" in air, water and other stuff that aren't a vacuum because it take a longer route, it doesn't go 100% strait on, it hits stuff on the way, changes direction a bit, hits something again, change direction again, so the DISTANCE its moving is slower, but it's SPEED is still C. BAM. edit: the best way to describe it's movement is in a zig zag
Speed of light is the same EVERYWHERE. It's just the path light takes increases on anything other than space so it takes more time to go from point A to point B but that doesn't make it slower. It's its velocity that changes.
Honestly i could listen more about lenses!!! More lens episodessss
The fact that I'm waring the same glasses as you is amazing
I'd probably have the same reaction to be fair! As you can see on my channel (sly self-promotion?) my glasses aren't even close!
Oh wow. I didn't know that the video was on curiositybox.com. It's so amazing for you guys to host his video on your site.
"Like everything in my life, it didn't work" 2me4meirl
correction: transparent materials do absorb some light and turns it to heat, they also reflect some light, causing a mirror effect, most of the light though, is going through
would love to see a video about depth of field and how smaller vs bigger apertures affect it. also of course the science behind it.
Light doesn’t actually move slower in other mediums, it just takes a longer path through it.
Also some people don't have lenses in their eyes, called Aphakia. They have to wear Glasses or contacts to accomodate but they'd still only have 3 lenses even with the glasses.
Hi jake. I love you.
I love you too
Me too
At 06:00 the narration says that f-stop is a fraction, which is correct. The formula shown in the illustration says "area of aperture", which is incorrect (since area is proportional to aperture squared), it should read "diameter of aperture".
i just know theres a V Sauce 3 masterpiece coming along any week now. so pumped
Thanks to taking photography, I actually understand some of this better than the blank staring at the screen I would have done otherwise. Even though I dropped out near the end.
We can talk about how cool it was for us to figure out how to shape and position systems of lenses to get complicated methods of focusing. But I find it amazing that evolution figured out a surface that accepts visible light information and a lens system to focus it specifically on to the retina. 8:25 Hee, his face looks really tiny.
Infrared light can easily pass thru glass. Take your glasses or a glass (like the one for drinking) and try to use tv remote so that the infrared light has to pass thru glass before it hits TV. It works just fine. Or you can see infrared light with your cellphone camera which obviously has glass lens.
"Inquisitive little turtle." I like this.
2:13 I have a question. If glass is not transparent to infrared, it shouldn't be transparent to visible light also, right? Visible light has higher energy than infrared, and therefore the atoms of glass should absorb visible light if it absorbs infrared.
Wanna hear a joke? Me too
ash2730 - a young man and woman drive out to the empty field outside of town and do the things young men and women do in cars in empty fields. As the young man lights a cigarette, the woman says _”I’m sorry, I should have told you before, but I’m a prostitute and that’ll be $25”._ Without skipping a beat the young man takes out his wallet, pays her and continues to smoke his cigarette. After a few minutes the woman asks _”well, aren’t we going back?”_ to which the young man replies _”I’m sorry, I should have told you before, but I’m a taxi driver and it’s $50 for the round trip back to town”._
Ok, im going to tell a joke. subscribe to my flannel.
Micheal uploading on Vsauce
@@grendelum looooool
#MeToo
i'd love to see a video hosted by jake, all about cameras and lenses
*when youve been looking for a website that does a thing that you want it to and then DONG uploads and you find the perfect one*
That has actually got to be a beautiful moment - did you watch DONG _hoping_ that they would give you the solution!?
I want more about the lenses
These are some cool *websights.*
the saddest end of them all "Like everything in my life, it didn't work" .. take care of you man wtv the case we love you, remember that.
More camera nerd-ery, please. I've never felt to connected to a DONG video. This was great, thanks.
Jack pulling thr good old out of focus joke We love you Jack
Lot of love for you, Jake!
5:51 hey Jake, I just have one note. Phone zooming is more accurately described as cropping since you are losing all the piexls that you aren't showing.
the essence of being interesting is being interested-- nailed it
The example for waves could've used a steel rod or a similar rigid material as an example instead of ropes since a rope is flexible. Because I was kind of confused initially as to why would the other points bend!
omg i swear i wondered all this last month and couldnt find any answers, thanks Vsauce!
Light isn't a particle or a wave it can just be described as either, but in reality it is much more complicated.
"Like everything in my life, it didn't work." Are you okay, Jake?
For the curious: that huge beautiful digital cine lens that Jake is holding is probably a Canon T1.5 Cinema Prime... perhaps a 24mm, that costs over 4000 bucks a pop. If you want a full kit with all 6 lenses of the same line, you'll be paying almost 22 thousand bucks. There's also one close up shot where I see the blue band typical of ZEISS CP prime lenses that floats around similar prices, a bit more expensive. Those are indeed beautiful not only for being lenses, but for being some of the absolute best in class... xD
ill take your word for it
please make another (longer in depth) video on lens please!
Ok, I get it how the light slows down entering a substance. Now, what speeds it back up when it exits? Now you know why I drove my teachers bonkers in school.
Why are glasses opaque in infrared lights when visible light does not have enough energy to be absorbed by it?
That ray optic simulator is the best!
These Vsauce people are the best content providers on ze web.
I think the human eye can produce different magnifications by viewing something out of focus. Seeing as the Magnification is Object Distance divided by Image Distance, it changes when Image Distance changes which is what happens when we see something out of focus. The brain mostly compensates for this and will refocus on an object. (You can of course just change the Object Distance but there's probably no need to explain that things farther away look smaller.) Corrections welcome.
"My inquisitive little turtle" 😂
I was just watching a PewDiePie video with him reading a meme about contact lenses...and then “LENSES” pops up XD
The universe is a truly magical place sometimes! Thanks Universe, you cool guy
The another time is just now! More lenses plz
Video video ! One correction though, light slows down when entering matter only for visible light, Take a look at optical index in the X-ray domain, you'll find that it is inferior to 1, which mean the group speed of the photon bunch is higher than c.
Philip Moriarty. What a crazy guy. That video is a classic
Contacts pre-roll. Another contacts ad on the right of the video.
What i sometimes notice is that when you zoom in the virtual image off your phone you can focus your image better so its easyer to get good pictures zoomed in than not :P
Focal length: front of the lens to the sensor of the camera. Just want the information here to be as accurate as possible.
Does this allow for some eyepiece (possibly just a small lense) that we can wear on our eye that can zoom, yet keep the same quality image (that being not phone-zooming, rather tha lenses bending light)?
This is so well spoken
Could it be theoretically possible to slow down light particles enough to see them move? Or even stop said particles? By trapping them in a loop where they keep bending without escaping?
I'd love a series in which Jake nerds out about cameras.
Great supplement to my Digital Cinema degree I'm working on right now. :)
Whenever Jake makes a sentence, he always has to pause before the last word lol
Wait, does light actually slow down in different mediums then? I thought it just appeared to slow down because it bounces around on atoms inside the medium (hence why the denser the medium, the slower it appears) but the way Jake described it made it sound like it actually does slow down.
That outro is wonderful
It truly is!
I love lenses too... SO KEEP TALKING ABOUT LENSES!!!
8:18 don't say that. Great video Jake. Although I am wearing glasses, *I* am looking at you through 3 lenses . Just in my case and a few others.
My photography teacher will love this video
its so fascinating that it scares me
You can see where Jake was wearing his Vsauce Slave Shackle™️ on his left hand. Michael won’t like that you took that off, Jake.
6:38 Ah, imagine being able to zoom with your eyes
I was hoping you would talk about Pierre Angénieux, my great grandfather, who worked with zoom and whose camera filmed the moon landing. As you said, maybe another time :)
*LENSES*
*LENZEZ*
Jake! How does this work?! *Well my inquisitive little turtle*😂
I'm only seeing you through 3 lenses, even though I wear glasses, because I was born with aa cataract and had my lense taken out
Looks like Jack got transferred from Unbox Therapy to DONG.
WE NEED VSAUSE
i still wonder how valve's f-stop game (a concept portal 2 mechanic that was shelved due to it being too different for a sequel; kept secret from the public as it was interesting enough to be used in a future project) would have worked…
6:35 Are there animals that have zoom lenses as eyes? And I'm not talking about "digital" zoom where they just have really many receptors on their retina an so have a very high "resolution". I think birds of prey have eyes like that. So I'm talking about eyes that actually can change their focal length.
have no idea about how cameras focus but I'd assume you would need a whole new lens to change a focal length, bird's eyes are too similar to ours to be able to do anything drastically different (ofc they can probably see in slightly higher quality etc) EDIT: www.quora.com/Why-cant-we-zoom-in-with-our-eyes-Whats-the-difference-between-an-eye-and-camera-lens-Why-didnt-we-evolve-so-as-to-be-able-to-zoom-in
I'm so happy that DONG got it's own channel. I love doing online now.. guys.
If light slows down when travelling through materials, will it speed up again after leaving said materials? And if so where does the energy for this change in velocity come from?
Yes, it speeds up upon leaving. It doesn't gain or lose energy when going between materials.
Gotta love how the DONG channel doesn't post videos about things you can do online anymore.
3:18 does it mean that an opposite part of the wave is moving faster than the speed of light?