The Light Cancelling Flashlight Experiment (Michelson Interferometer)

Рет қаралды 328,720

Күн бұрын

In this video I talk about the idea of a light cancelling flashlight. I show you how you can make a setup in which you actually gets a light that is less bright when you shine more light on it using a Michelson Interferometer setup. Learn about the idea of light cancellation using the same ideas as noise cancellation.
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DISCLAIMER: Any experiment you try is at your own risk

Пікірлер: 740

@TheActionLab 5 жыл бұрын

How could I not mention LIGO!

@MammaOVlogs 5 жыл бұрын

yeah what's up with that ? :)

@WakarimasenKa 5 жыл бұрын

I was just about to ask. This is the first video, Ive seen that actually has the experiment and not just a diagram.

@onthedepth69 5 жыл бұрын

Yes I also think about iy

@ArthurEKing8472 5 жыл бұрын

I was LITERALLY going to mention this... lol. You saved yourself a mildly acerbic comment, lol.

@HeenaPatel253 5 жыл бұрын

The Action Lab first

@andreimihai3658 5 жыл бұрын

My brain during exam: *information cancelling device*

@hoteny 5 жыл бұрын

I feel like this comment will go top

@ariefdharma1458 5 жыл бұрын

got a history test.... Me : Light cancellation *fursther procrastination*

@danisahawneh5435 5 жыл бұрын

Andrei Mihai lwas 6

@kirjuschaks 5 жыл бұрын

yeah man

@100ksubscriberwithnovideos8 5 жыл бұрын

😂😂😂

@James42_ 5 жыл бұрын

This is the same setup uses at LIGO that detected gravitational waves :)))

@shlokbhakta2893 5 жыл бұрын

Bach Lan oh yeah it's crazy to think we see gravity with the power of MIRROR

@satheeshvarma.s.j. 5 жыл бұрын

I was about to comment this

@michaelblacktree 5 жыл бұрын

Now I understand how LIGO can be so sensitive.

@DanielGonzalezL 5 жыл бұрын

Makes sense, since it's so sensitive to anything at all

@Altorin 5 жыл бұрын

@@f.falkwings well, it's this setup deep under ground and spread over a kilometer but yeah it's basically the same setup The trick is the bigger you make it the more sensitive it is, the one at LIGO can measure differences smaller then the width of a proton

@abeljohnson6 5 жыл бұрын

While making this video Action lab:everybody in the house stop breathing its making the light source vibrate

@MrPablosek 5 жыл бұрын

@@HelloKittyFanMan. tf is wrong with you

@JoseGranny 5 жыл бұрын

@@HelloKittyFanMan. Laying cable

@skillhhy8707 5 жыл бұрын

@Freeway

@serious.business 4 жыл бұрын

@@HelloKittyFanMan. You're some kinda demented asshole to think women poop.

@10Carpet 2 жыл бұрын

@@serious.business i agree

@rh001YT 3 жыл бұрын

There's a type of little kiosk in stores where if you stand in/under them virtually all exterior sound vanishes. Also, sound from speakers in the kiosk did not travel outside of it.

@nikhil8003a 5 жыл бұрын

Hello Action Lab!! Whenever you post a new video, it will be around 10:00 PM in INDIA and after having dinner it gives a lot of satisfaction to watch your science experiments. Thanks a lot and LOVE FROM INDIA♥️♥️

@SaebaRyo21 5 жыл бұрын

Yeah... I just watched it around midnight... and he explains greatly also

@josexavier5518 5 жыл бұрын

Same I just finished my dinner as well😂

@nikhil8003a 5 жыл бұрын

@@AnkushKun hey I'm doing arduino water level indicator using ultrasonic signals. Can you share some resources please.

@nikhil8003a 5 жыл бұрын

Thanks for your love😆😆

@ppskg1 5 жыл бұрын

Pls subscribe to Mystic Dragon EX

@AliYassinToma 5 жыл бұрын

A flashlight that instead of lighting makes it dark ... Sooo it should be called unflashlight??? Or flashdark ... ??

@bairfamilyfarm1336 5 жыл бұрын

Is a "flashlight" really an "unflashdark"?

@AliYassinToma 5 жыл бұрын

@@bairfamilyfarm1336 probably.. idk

@prism2451 3 жыл бұрын

There is no good word for what we call Flash light or torch. It can be called LED

@AliYassinToma 3 жыл бұрын

@@prism2451 thats why i like arabic .. there is way more vocabulary to precisely describe almost everything :/

@pleb6261 3 жыл бұрын

We already have an unflashlight or flashdark We call that opaque object in front of light source (I guess shadow is dark light, eh)

@pbp6741 5 жыл бұрын

Fabulous demo. Surprised you didn’t mention ligo after all that work.

@simenjorissen5357 5 жыл бұрын

Read the pinned comment

@pbp6741 5 жыл бұрын

simen jorissen His pinned ligo was posted a day after I mentioned it. It simply didn’t exist at the time of my comment.

@simenjorissen5357 5 жыл бұрын

@@pbp6741 sorry my bad

@sourabhperuri1698 5 жыл бұрын

This video is exactly the reason why i got to know your channel. I had this doubt for a long time and when i searched it in youtube, i got your other videos on additive mixing, subtractive mixing and those on 'if black and white are colours'. Now my doubt is finally cleared. But i can't stop following your channel as your experiments are on the next level. Thanks a lot. It is actually surprising to know that you came to this height from crushing a golf ball on hydraulic press.

@ReesePuffSwag 5 жыл бұрын

Really cool aspect to this experiment; you talked about how doing something as simple as walking on the floor can change the phase between two light sources but temperature differences actually do the same thing so if you breathed over one light source you could actually see a phase difference.

@Fermion. 3 жыл бұрын

Could make one hell of a security system with how sensitive that setup is.

@villentretenmerth11 10 ай бұрын

*bird sits on the roof* >>alarms blaring

@AttilaAsztalos 10 ай бұрын

Sure, if you're trying to detect a burglary happening in your neighbor's house...

@Fermion. 10 ай бұрын

@@AttilaAsztalos I was thinking more of a military base/nuclear plant type perimeter seismic defense system. I'm pretty sure a physicist could triangulate the exact coordinates of the slightest movements, based on variations in the interference patterns, then pass that data off to a programmer's software, which would automate the relevant security cameras to investigate, and deploy armed drones to intercept a minor threat, or send alerts human security personnel, if more lethal countermeasures are necessary to neutralize a major threat. This would be way too sensitive for normal civilian use. Every step in the home, speaker bass drop, kitchen appliance, car that passes by, etc., would set off a false positive.

@AttilaAsztalos 10 ай бұрын

@@Fermion.Wow, this has gotta be a personal best at thread necromancy... ;) Anyway, LIGO detects gravitational waves with the same basic setup and it's just HILARIOUS to read up on what they need to go through to eliminate vibrations caused by, well, everything else...

@Fermion. 10 ай бұрын

@@AttilaAsztalos Ahh, you're right about LIGO. I totally forgot about that. But, the thing about that is that it would be super expensive, with the miles and miles of vacuum-sealed tunnels, and several teams of world class scientists. And yeah, I made several edits after a few drinks lol.

@nayankulkarni5131 5 жыл бұрын

3 words for you. YOU ARE AWESOME. Thanks for giving us all of this stuff!

@DanielGainesDanno115 5 жыл бұрын

Love these experiments. I love learning new things that this guy teaches on science. I love that he makes it fun as well as educational.

@FacterinoCommenterino 5 жыл бұрын

Today's fact: Baked beans are actually not baked, but stewed.

@dio66791 5 жыл бұрын

@George Costarica h

@punypete8724 5 жыл бұрын

@George Costarica d

@punypete7106 5 жыл бұрын

@George Costarica p

@familyguy2023 5 жыл бұрын

@George Costarica c

@thelockedbox2095 5 жыл бұрын

WHAT?

@vinayaka9438 5 жыл бұрын

Any odd multiple of half wavelength actually.. Since moving by an even multiple will lead to constructive interference..

@supernovactc3283 5 жыл бұрын

(2n+1) * wavelength n€ Z

@alexanderpoltzer8885 5 жыл бұрын

I knew about how noise cancelation works with offsetting sound waves by 180 degrees. But I wondered if light cancelation was possible. Whe I thought about it I realized how hard it would be but am very happy now to see it explained in a video. Thank you!

@poopsiexpants 5 жыл бұрын

Disappointed. Still waiting for the flash-shadow like on the thumbnail. 😂

@shakilahmed6870 5 жыл бұрын

yes

@sureshkumarthottempudi8298 5 жыл бұрын

I too

@cryptfire3158 4 жыл бұрын

i know heh. Like.. couldn't he just tell us he couldn't do it, rather then making us watch the whole video?

@prism2451 3 жыл бұрын

@@cryptfire3158 all of his thumbnails are like that. I still like him

@oerlikon20mm29 3 жыл бұрын

you cant do that lol, thats like making a negative sound wave... how the hell does that work. would be hella cool tho, i would love to see it happen

@Bunny-zq9su 5 жыл бұрын

Which would absorb more heat when left in the sun: a computer screen displaying black or a computer screen displaying white? Also, do different colors display at different temperatures on computers? (Not left in the sun, but just on its own indoors.) Does blue display any warmer than red for example?

@AlexDicy 5 жыл бұрын

@Musketeer Oliver ...............

@TankYou90 5 жыл бұрын

interesting

@robstamm60 5 жыл бұрын

Thats a really interesting question. If we use an old phone with an LCD and no way to turn down the background illumination of the screen then a black screen will definitely heat up more because the lcd crystals absorb nearly all of the sunlight+backlight. If we use a modern OLED display it gets a bit more difficult to answer this question but we can generally say that a completely black oled screen doesn't use ANY current so the device will not heat up from energy losses from the OLEDS and I can't think of any reason that an oled will absorb less sunlight if it is turned on (especially in the IR-range where the OLED doesn't emit light anyway)

@Bleepbleepblorbus 5 жыл бұрын

It's a close one.

@Justin-lc8wk 5 жыл бұрын

@@redtoxic8701 on lcd there is one light source with layers that make color so brightness on lcd is heat but on oleds? im not sure.

@panzerofthelake4460 5 жыл бұрын

What I have learned: my brain don't want to.

@ThePrufessa 5 жыл бұрын

Yeah this one was hard to follow. I will have to watch it again because I'm completely lost right now.

@defaultkid99 5 жыл бұрын

N i x D a

@dellhpfree 5 жыл бұрын

You are an amazing teacher. Keep up the great work. Thank you 🙏.

@y33t23 5 жыл бұрын

"Everybody please don't take a shit now it disturbs my not-light."

@fullglorywr8322 5 жыл бұрын

Wow. This channel has put science into so many of my twin brother and my comic characters that we make. There’s a creature that has light cancelling eyes. Looks like it’s eye structure will have to be completely different than what I originally wanted it to look. One on the front which emits a light cancelling glow, 2 on the sides and on on the back of the head to receive light. Which goes into a bioliogical beam splitter type organ.

@ryantwombly720 5 жыл бұрын

Thank you soooo much. This is a wonderful visualization of concepts that come up so frequently in science and science explanation. Truly a service to education.

@parasar1980 5 жыл бұрын

Love from INDIA The Action Lab!!! ❤️❤️❤️

@barkatrathod9301 5 жыл бұрын

Subscribed your channel

@bran1039 5 жыл бұрын

i can tell by your name btw cool name

@parasar1980 5 жыл бұрын

@@bran1039 THANKS! btw that's my father's name...mine is Rishabh Raj...aka... RR

@parasar1980 5 жыл бұрын

@@barkatrathod9301 hey! Thanks!

@bran1039 5 жыл бұрын

@Dhananjay Parasar oo cooler name

@christianterrill3503 5 жыл бұрын

Blowing my mind again!

@stickmandaninacan 5 жыл бұрын

this is basically a mini version of LIGO, they use the same mechanic to measure the tiny mirror movements to detect the gravitational waves

@Speeder84XL 5 жыл бұрын

Really cool! Intresting that you can make a device that sensitive to vibrations, but yet so simple.

@Dejoblue 5 жыл бұрын

The coolest thing about this was how sensitive it was. That was crazy! :)

@b12virus63 3 жыл бұрын

ohh! now i understand that's the setup they used for gravitational wave detector ! that much of accuracy is awesome !!!

@Waterdust2000 11 ай бұрын

This channel doesn't disappoint, I was hoping to see a total cancellation here of the light. What if you did this in a anti-vibration & sound dampening room? an maybe throw in the vanta black as necessary for light control.

@waynefarrellvoiceovers Жыл бұрын

I really enjoyed that. Beautifully explained.

@saharshbehal8766 5 жыл бұрын

It always a gr8 experience on getting that free knowledge from you sir thanks for all the effort

@Toastmaster_5000 5 жыл бұрын

Pretty cool experiment. I wonder what would happen to some of the wave patterns if you tried using a polarizing filter.

@jaikumar848 5 жыл бұрын

Hi action lab! Could you please make more videos on quantum mechanics stuffs...like entangled photons,eraser experiment etc !! Btw great video as always

@Sorrywerefull 5 жыл бұрын

You are really funny in a geeky kind of way. I love it when you try doing things that you know won't work for us. Not talking about this video specifically.

@chillaxter13 5 жыл бұрын

Love the idea of this! These are the experiments I watch this channel for. We do need to get you a nice, large white board though...

@marcularis 5 жыл бұрын

Man, you're reading my thoughts!😂 I was thinking of the exact same thing some months ago! Thank you for existing! :)

@NC-oy8hq 3 жыл бұрын

Just watched this a second time ... the action lab is awesome. Thanks for helping me and my kid learn.

@AwesomeTheAsim 5 жыл бұрын

Oh my god! That's my idea and I have been trying to make it possible. But it looks like it is impossible unless you put a black hole inside it because black hole can suck light. I am so glad you did this video

@obama_is_hot6 3 жыл бұрын

8:30 honestly that was the most intresting and cool part. id love a whole vid on just that alone

@swr1240 5 жыл бұрын

So awesome. You think of some fascinating stuff to experiment with!

@intunemediaresources5938 3 жыл бұрын

I love your channel and you just seem like a genuinely cool dude! Much love and support man!

@planeteuropa 5 жыл бұрын

Hi Action Lab... I wonder if there is any beam splitter " equivalent " for heat waves ? - to cancel out waves from two heat sources. Your thoughts on this?

@mikewest3108 3 жыл бұрын

That's a very cool experiment.

@JeremyMcMahan 5 жыл бұрын

Amazing video! Learning is so fun.

@cernejr 5 жыл бұрын

I really enjoyed this video. Thank you!

@Krfstniper 5 жыл бұрын

As always the explanation was super clear! Thanks a lot :)

@harish5657 5 жыл бұрын

great work sir.

@GrowingAnswers 5 жыл бұрын

I think the vibration sensitivity shows a good demonstration of how high power telescopes need to be vibration isolated. People who have never used a telescope wouldn’t understand that. This device shows a good representation of that. The difference though is that a telescope usually takes longer to settle out after the vibration starts.

@samsayshecc618 5 жыл бұрын

_Those markers screech through my heart every time..._

@edwinpj7637 5 жыл бұрын

Same here. I became extremely uncomfortable. Maybe both of us have pieces of Cat DNAs.

@filiplaskovski9993 4 жыл бұрын

Same bro

@gamingmonkey0549 3 жыл бұрын

We don't need a flash-dark in 2021, please continue your work, we don't need it, but we want it

@balajisriram6363 5 жыл бұрын

You are an amazing teacher

@aeroant 5 жыл бұрын

So well explained! one of your best videos! I think I know how gravity waves were measured now :D

@OnTheRiver66 5 жыл бұрын

Another great video! Years ago I saw a picture in an encyclopedia of search lights arranged in a large circle. They were aimed at one point in the sky overhead. The beams were bright until they met at the focal point and beyond that they were not nearly as bright. The explanation was that the light beams interfered with each other. I’ve tried to duplicate that with flashlights and lasers in my house with no success. Have you seen anything like that picture in the encyclopedia?

@aaardvaaark 5 жыл бұрын

Awesome video, as always.

@hackandtech24 3 жыл бұрын

i didnt think this video would be this cool. nice

@harishs7384 5 жыл бұрын

Tq fr the video, action lab love❤️

@DXPAlien 5 жыл бұрын

u explained it well sir

@spenceranonodium711 5 жыл бұрын

Loved the video, had a different idea when I read the title. Not disappointed though lol

@dixieandbuck 3 жыл бұрын

This seems sorta similar to the polarized sunglasses trick.

@igorgiuseppe1862 8 ай бұрын

you also build an motion detector with this experiments... or an vibration, quite cool!

@assasinatorx325 8 ай бұрын

I never understood how to cancel light but you gave me an important information i was thinking about an extremely sensitive ground vibration sensor for my snake robot and your laser fringe vibration gave an idea to make one

@SuperGattan 5 жыл бұрын

Excellent explanation..... so in theory can we make a NAND gate or a Boolean function from this phenomenon?

@fasiuddiin 5 жыл бұрын

This guy is insanely amazing

@Demnus 5 жыл бұрын

By the way, if you record amount of oscillation of the interference pattern, would it produce sound? Might it be the way to make supersensitive microphone?

@davidwuhrer6704 3 жыл бұрын

Yes. It is called a laser microphone, and it is used to listen in on people's conversations by the vibrations of their windows.

@intendedviewer922 5 жыл бұрын

Another , excellent , video

@lukenoble2539 3 жыл бұрын

*Me in the lab doing this experiment* My friend: *lives* The lights: 🤯 Me: who allowed you to breathe

@futuregamers7341 5 жыл бұрын

Im so sorry for your loss

@xNecromancerxxx 5 жыл бұрын

YES!!! another ActionLab video!! I love it! 😊

@Slayermunch 4 жыл бұрын

I love your channel a lot!! I am liking all the videos. 😋🙂 you’re awesome 😎 please make a video on how to see photons in light. Or atoms of anything .

@ksp-crafter5907 5 жыл бұрын

Please try the "Delayed Choice Quantum Eraser" experiment - it would be so cool because it is a kind of time travel device (for subatomic particles at least)! @The Action Lab

@koreboredom4302 4 жыл бұрын

People on the street: "hey where are my sunglasses?" Me:

@fanmaxis3004 3 жыл бұрын

ZZ Top:

@Monoceros_323 4 жыл бұрын

Wouldn’t be a flashlight then now would it, it would be a flashdark. 🤣😂😂

@fanmaxis3004 3 жыл бұрын

Nyuk nyuk nyuk

@onbedoeldekut1515 3 жыл бұрын

How about if you used a filter instead of the mirrors? I'm thinking of something like lenticular plastic or an opaque diffuser. What I think you're wanting to do is to homogenise the wavelengths of the light sources. Lenticular plastic will diffuse the light along the bars, but an opaque diffuser would cause the light to act more erratically.

@VivekYadav-ds8oz 3 жыл бұрын

If hypothetically you could completely cancel out the two light/photons, wouldn't energy conservation be violated? You generated two photons, but after interfering there are.. none?

@jonathanhaehnel5421 Жыл бұрын

wondering the same. I think it will not be possible by can't really explain why. maybe these light beams could be separated again?

@karma_yogi_42 5 жыл бұрын

This was a good episode

@ccfmfg 5 жыл бұрын

Mr.Action lab,Please do a video on canceling magnetism.North,south and or both.Thank You.

@MaestroLives 5 жыл бұрын

Great video dude

@StefanReich 5 жыл бұрын

Such a good channel

@jandrei32 5 жыл бұрын

I met James today at lagoon, big surprise :D

@raghavendramirji 5 жыл бұрын

I have been wondering about these since childhood 😁

@vigneshbk5131 5 жыл бұрын

LIGO which is used to detect gravitational waves uses this principle only.

@user-we6lw3ff8m 5 жыл бұрын

One of the best things i have seen on KZfaq . Keep up this good work man, congratulations.

@jimmy-jamesolivier-mccutch2126 5 жыл бұрын

i love this channel thx

@prabakarankarthikeyan2084 5 жыл бұрын

Thanks to give some ideas bcoz long time I working on this thing... Could you try with actual flash light which have white beam... So actually i need to know....

@TheGreenMedicine420 5 жыл бұрын

This is awesome.

@salcontrino 5 жыл бұрын

Can you make a video demonstrating the sound cancellation idea?

@lambda4931 3 жыл бұрын

There was another interference pattern at the laser. The light was conserved with this second pattern. Its pattern is always opposite of the “screen” pattern.

@Mr.Unacceptable 5 жыл бұрын

Where did you get that light table Michelson Interferometer? I'm working on making a light table from a long coffee table. That would work really well as an insert component.

@cattybound2011 5 жыл бұрын

Hey this is a great video! Better than usual! You're a lot smarter than you sound! 😁😁😁😂❤️ J/k

@josebarria3233 3 жыл бұрын

Actually even if the mirrors are equidistant from the splitter, there will be an interference pattern. The reason lies on the fact that the image projected are made of multiple "rays" and every ray travels a slightly different amount of distance (called the optical path) and arrive at the screen with different phases anyways. If your projected image is an infinitesimal dot, then there will not be any interfere.

@BariumBlue 3 жыл бұрын

I don't suppose it'd be possible to have a material that reduces in albedo when it's excited by some light source? My other guess was some polarized light and filter shenanigans, though I can't figure out how that could work.

@nikdoesstuff9338 3 жыл бұрын

Me: just how sensitive are you? Soft boy: have you ever heard of a Michelson interferometer

@imiG2000 3 жыл бұрын

I know it might be late to comment here but I'm curious. Why doesn't the light beam cancel itself out when it is reflected from the mirror after the first time it passes the beam splitter? Does the reflected light have any effect on the light that is going towards the mirror?

@heideknight9122 3 жыл бұрын

Wow this is really cool. Too sensitive of a system for everyday use though.

@danigaming4139 5 жыл бұрын

Very amazing,ilove what you were doing i learned something new bout this video Keep it up bru....👍👍👍👍👍👍👍👍👍👍👍

@iknowredstone1234 5 жыл бұрын

what happens when you shine the "grid pattern light" throug a polarizer?

@franzliszt1127 5 жыл бұрын

This video is more useful than school

@PersonausdemAll Жыл бұрын

😂All is more useful than shool

@R2Bl3nd 5 жыл бұрын

If you shine the reflected light on a solar cell connected to an audio recorder, you could record the sound of the vibrations. Like how the CIA or police did/do surveillance with lasers reflected off of windows to hear conversations inside rooms.