Looking Glass Universe
This video is about the double slit experiment- the experiment that first convinced people that light is a wave.
Supported by Screen Australia and Youtube through the Skip Ahead initiative.
Safety and where to get the supplies:
I would love for you to try this experiment but please be careful with the lasers. If you’re going to buy a green laser then it’s crucial that you buy a proper one. Green lasers emit light a lot of invisible IR light and in cheap lasers this often isn’t filtered out well. Blue/ violet lasers can also be dangerous for another reason. Our eyes are terrible at seeing these wavelengths, so the laser will look much less strong than it is, which means you might be playing with a dangerously strong laser without knowing it. Red lasers are generally the safer bet. I saw the effect I was looking for even when I used cheap ~1mW red lasers, so it will still work for you!
If you’d like to invest in a nice laser though, this article has some trustworthy green laser brands: https://www.planetguide.net/astronomy-laser-pointer/
Another way to buy lasers that are eyesafe is to get them from school science lab suppliers.
(Note: in some countries it’s illegal to sell lasers over 1mW. Please check the laws where you live. In the USA the limit is 5mW)
The smoke machine I got used glycerol. I’m very suspicious of breathing in that smoke though, especially since the room can’t be too well ventilated or it won’t work. Fine particulate matter is a serious health risk in general so even though glycerol is nontoxic I think it may still be hazardous to inhale. I recommend wearing an airtight n95 mask or similar while doing this experiment.
It found it a bit tricky to source the double slit cheaply in Australia- your best bet might be a science lab supplier. In the USA you can get it on amazon though.
Video credits:
The beautiful animations in this video are made by Kathy Sarpi: https://kathysarpi.com/
Thank you to Screen Australia and Google Australia for funding this project, and to the wonderful people at Screen Australia who helped me throughout the process.
Thanks also to all my beta testers (aka friends)!!
Source
Many of you requested I show what happens when you measure which slit the light went through. I've finally made that video! https://youtu.be/sAm7iVdAvTA
First of all it always draws its possible paths as a wave, even with one slit it shows a wave pattern on the screen, there is just no second slit to create the second wave and this famous wave pattern with gaps. Secondly Its about the time in the equation – timing! It goes through all possible options (wave pattern paths) very quickly, but when you observe (or measure) you say "stop" and see where you actually catched it. In other words tis is the formula for real randomness, it is moving quickly through all options in circles snd the outcome depends on when you say
"stop" (when you or anything interferes). One open slit is one world, a second open slits is a new a second world, you cannot simply summarize those probabilities and merge them as one, it requires a new probability calculation that is again done in waves and this is a bug in the design, sone developer thought it is ok to recalculate the possibilities with two slits also either s new wave pattern that goes through both slits at the same time, its just a bad design or maybe a teal time calculation necessity so things get calculated quickly. Maybe there is a way to use and utilize those gaps in this bug (feature)? Just a thought from an amateur visiting "randomly" over this video. Bit will accept a Nobel price
Here from saleem sir's class
If you don’t understand it, then what hope do the rest of us have? Even Richard Feynman said he didn’t understand quantum physics!
Try something different , go into a darken room with a little red stand-by light
At about 3 meters from the light hold up your thumb to block the light from view
Notice how the light goes the opposite way ?
Fantastic! Great video 🙏
I'm finding it hard to accept your results based on the light source and the slits. You are using coherent light, which doesnt exist in the universe except as a laser beam. Secondly, I would like to see a horizontal narrow slit going from one side to the other some distance. That should do away with the adding and subtracting crests and valleys. I think a lot of people are misreading the double slit experiment. The light source should be traveling in all directions as it does in real life, not a flashlight, directed beam and certainly not a coherent one. I think if you used a lantern behind the horizontal slit, you would see the true nature of light, not an equal beam across the detector sheet, but one that would be brighter toward the center and weaker as it goes left or right on the paper. The reason is because the source of light is like a star, or a sphere, so that light shown on a two-dimensional surface would reflect the spherical source and only the center would be bright. When the two slits are used, we merely see the light source reorganizing itself into a spherical source as it EXITS THE SLITS, causing the trough and crest distortion.
La realidad es una ilusión creada por nuestro serebro y la medición espacio tiempo es creación humana y querer salir de esta realidad es desaparecer somos como personajes de un vídeo cuando se haserca al orisonte este se aleja. Somos prisioneros de esta realidad.
Amazing! I stumbled on your video while trying to really understand the double slit experiment. When I saw your waves light up, I thought how was that possible? I thought when you’re observing the light, it starts to behave like a particle. This sent me down a rabbit hole of learning and understanding at a deeper level. People kind of lazily use the term observer effect. Your experiment help me understand that observation alone doesn’t turn a wave into a particle trying to figure out which slit does. This is my next rabbit hole. I feel like science has this wrong. I hear things like the simulation hypothesis reference the observer effect as evidence that we live in a simulation. This drives me nuts because simply observing does not change light from a wave into a particle that only happens when you try to determine which way, or which slit the light went through and the only way to do that is by tagging it or filtering it and obviously when you filter the light, it’s gonna change it. I feel like science is missing that point. Have you created anything to help explain the “which way” process? Have you been able to do this experiment with one particle at a time?
The observer effect is mind blowing
I need a platypus now ?
kauft laser lieber bei Ali, da weis man das die Leistung maximal ist. Immer auch Hirn einschalten versteht sich von selbst.
How about light is a wave spreading trough photons?
are you based in australia?
id say the water bends around the object and spreads out due to waters surface tension or its "sticky" property rather than it replicating what light would do, i like to think of light as a transfer of vibration across a medium rather than it moving atall its just exciting the particles next to it and transferring a wave like function like youd see on an oscilloscope
So interesting 🥰
Great presentation. I never thought about trying the experiment on my own until today, so I googled to see how it can be done at home and here I am. I actually want to demonstrate this experiment on live. I actually have a higher understanding of light and the way reality appears to observers. I have kept my understanding of the universe mostly secret except to a few people I know for many years since the knowledge was given to me. 10 years or so. I'm going to use this type of demonstration as evidence to show that not all light is visible to observers, the "horizon" pertains to the eye/s as its visual limit, and that light doesn't travel in straight lines even though they appear straight to the observer.
I figured maybe I can give you a little bump in your knowledge about your experiment's results. I know that using smoke allowed you to see light that wasn't clearly visible before, but do you think that you uncovered all the light? Think about it like this; what you are looking at in your experiment is actually light that is emitting from the emitting laser and entering your eye to be processed into an image. If you move about the room you can see the emitting laser light from anywhere in the room so obviously there is light emitting all over the room. Why can't you see that light? If you use your camera to take a long exposure image of the laser emitting in the experiment, it the camera sensor is receiving light constantly over time, why isn't it visible at all? Is it light? What is the difference between the emitting laser light, the light uncovered in the smoke, and the light observable by observers like yourself and your camera/s?
Now think about everything that you see. Ever seen those visual 3D artworks that look deranged until you are directly in front of it at the right distance and it becomes a clear 2D picture although you know that it's not 2D. That's because vision is 2 dimensional. Depth perception isn't possible by having 2 eyes like scientist tell us. It possible with only 1 eye, depth perception is a conditioned skill. Don't believe me? Walk around with one eye closed for the day. It's also evident by observing infantile human and animal behavior that accurate depth perception is acquired gradually overtime. A 3D image isn't possible to aquire from a singular point of view. Simply closer objects appear larger and can block the observers view of larger objects behind it. Like the experiment, the light from the object in the back that clears past around the object between the observer and once again closed in like a focal point where the observer can see the whole object behind the object in between. (Assuming the object is larger than the observing eye itself) Points out that light from objects of any size converge as they emit to optics regardless of the size of the lens. This is because light emits from matter in all directions and objects have dimensions themselves, so each corner of an object emits light in all directions almost infinitely and can converge into optical lenses of any size at nearly any observable distance. likewise, smaller objects than the observing lense can appear larger than the largest objects in view. This actual isn't possible if light travels in straight lines. Blasphemy? Look at any object that undoubtedly has a straight side wether small or large, near or far. It might take a while to see it but no object is actually visibly straight. All eyes have a fisheye effect which make straight lines curve. There is only one true observably straight line, it's at the horizon. Any object that can be held in front of you and cover the horizon perfectly and appear visibly straight, wether live or in a picture or video, will, in fact, not actually be straight but perfectly round, like holding up a hoola hoop around your head at eye level. Visual limitation is equidistant in all directions 360°^3.
How is it possible? It's simple mathematics. Maybe not so simple, but it's simply the mathematics that compliments the shapes of optical lenses which are all sphericules. Is that a word? I mean that at least the retina has a spherical shape. Regardless of the size and degree of the curvature of the lens, they all work by processing light using the same mathematical sequence which has infinite values that we call the ratio in regards to camera lenses. Just like camera lenses, people and animals have eyes of infinitely varying ratios and they all process light the same way using the Fibonacci Sequence.
"If you only knew the magnificence of 3-6-9 then you would have a key to the universe" Nikola Tesla, allegedly.
The thing is, a Fibonacci Sequence can have any ratio, you name the first 2 numbers and the rest can continue infinitely becoming proportionately larger in comparison to the prior dimensions, likewise, any object of any size to an observing lens of any dimension will emit it's light and reach the observing eye proportionately at any distance, much like a focal point like I said earlier. The Fibonacci Sequence is like a visual rule that no object can become disproportionate from that sequence within reality, the 3D realm. The Fibonacci Sequence is the law that maintains that objects are dimensionally proportionate and equal to all observers at any distance as well time/space. While the light emitting from objects is as real as the object itself, nothing can grab a distant object because it looks smaller. The roundness of objects can vary with the ratio of the lenses much like objects in the center of a fish eye image are slightly larger.
You ❤ understand by now that all this proportionate converging and diverging light are the waves of light in the double slit experiment. Imagine that the back wall in the experiment will have 2 individual observing eyes. One is 1" and the other is 2" with the center of each eye placed exactly at the same spot. 2 objects directly in front of them, say 2 circles for simplicity. One is 1" and the other is 2" and placed behind the smaller circle. The small circle is placed in front of the smaller eye with the 2" right behind it just far enough so that the outer edges of the larger circle are barely visible around the 1" eye. Undoubtedly the 1" circle is just a few inches away from the eyes while the larger circle likely double the distance past. Now, with the 2" eye and the circles in the same place, the smaller circle will appear smaller in front of the 2" circle than it actually is. Being half the size, to the 2" eye, the 1" circle will appear like it's much smaller, 1/10 the size even though it is closer to the eye.
Now I think that it's evident that waves aren't 2D but 3D. Of course they are. The Fibonacci Sequence is a spiral! A 1" eye looking at a 1" circle a is receiving light from every edge of the circle to every recptor of the retina. That is why light appears to scatter unpredictably. It's likely the brain that systematically filters certain photons or some other phenomenon but one thing is for sure, light spirals in a straight line, again, because of the Fibonacci Sequence. It is evident when environmental light is interrupted by spherical medium between an observer. The rainbow 🌈 shows us portions of these spirals, which are vortexes, tunnels, pillars, snakes, portals, and many other depictions.
You seem like a smart girl. I'm not the best at explanations or anology but I like to take my time and deep dive with my knowledge giving. 😉
13:03 that one scene from Project Hail Mary
"look really close at the beam u can see where the hair slits the light into 2" lol but u can't see the other rays of light? why not? that is ridiculous
if i hold a piece of string in front of a torch i dont get this effect, why not?
Excellent presentation ! I look forward to more. Thank you.
The difference is our range of vision. We only see in one spectrum. That is why is seems to change only when we observe it. It's changing it's just our perception.
Why does a essentially, cylinder like beam of light form a flat pattern on the screen implying the light "wave" has a polarised orientation?
But you observed it, and the wave didnt collapse
I noticed the double slit when I was about 10 years old. The curtains were set just right for the sun to create the pattern in the room that I was in. My Dad caught me trying ro figure it out and told me what it is…
Its more interesting from that curtains in the living room scale.
The wave and the partial travel together and influence one another.
That's so cute how you went to skool to get a degree in quantum stuff 😂🤣😆🤣😅🤣 😜😀 I dun kolledge 2 😜🤣😅🤣😆🤣
I like how light is so friendly, because it always 👋 waves at us 😂🤣😆😅🤣😜
I'm still trying to figure out how the unobserved light is unobserved when someone had to to see the results 😆🤣😅 so that's observed ‼️
Seems like a chicken and the egg thing to me 😁
Will light behave the same outside of this matrix construct though ❓😉
You are brilliant and beautiful thank you for sharing this fun with us 👏🎉☮️✌️👍😜