What Happens to Lasers Underwater? - Smarter Every Day 219

  • Published on Jun 20, 2019
  • Original Video on 2nd Channel: ruclip.com/video/zh1E3TbBF1Y/video.html
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    Snell's Window
    Total Internal Reflection
    An excellent video by the Engineer Guy about how fiber optic cables work:
    Index of Refraction:
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  • Science & TechnologyScience & Technology

Comments • 5 105

  • SmarterEveryDay
    SmarterEveryDay  5 months ago +1151

    I found this link later that night while fishing. twitter.com/smartereveryday

    • Mateusz Czerniawski
      Mateusz Czerniawski 2 months ago

      I have one question: Why you have red googles when you play with green laser, doesnt you need green googles? Nevermind, great video!

    • Ole
      Ole 4 months ago

      San Samman i think you need to find out for yourself😂😂

    • San Samman
      San Samman 4 months ago

      what happens if you were to record the internal reflection of the water from the outside *while making waves in the water* ? would bounce into and out of internal reflection due to the changing angle of incidence (since you would be making waves)?

    • In All Honesty
      In All Honesty 4 months ago

      Congratulations, you managed to leave 4 fish permanently blind with your little laser stunt... I'm here to serve you their civil lawsuit papers... You have 35 days to respond. Later

    • etmax1
      etmax1 4 months ago

      In regards to the acrylic rid, It's actually not a fibre optic, but rather an optical fibre :-)

  • T. Van der kooij

    Indeed, and in a public swimming pool, where the water is super wavy, its super easy to see.

  • GatorSmitty
    GatorSmitty Day ago

    4:54 Thats a Double Helix!

  • Nphekt
    Nphekt 2 days ago

    6:56 "You got the BFG-9000!"

    DIAMOND DESTROY 5 days ago

    I wonder if the fish are asking wtf us going on up there

  • Brendan E
    Brendan E 11 days ago

    Safety glasses on 😲

  • someguy099 [ADMISSION]

    What is that beard man

  • Hello Sweetheart
    Hello Sweetheart 12 days ago

    At first you had me then I was like "who brings an acrylic block and lasers fishin?" 🤔

  • Nick
    Nick 15 days ago

    I love how you’re not doing it in a pool and you’ve brought everything out to a lake and packed up a kayak with it all 😂😂

  • Chaks Dadivas
    Chaks Dadivas 16 days ago


  • Itz Chuckburg
    Itz Chuckburg 20 days ago

    looking through snell's window kinda creeps me out...

  • Ari Weber
    Ari Weber 20 days ago +1

    wheres mah lezzer? *laughs maniacally*

  • David Snyder
    David Snyder 21 day ago

    I don't know how to explain this but you have made me have a joy that I haven't had in a lot of years. You have made an old man have that wonder again. Thanks!

  • HonoR
    HonoR 21 day ago

    sharks with freakin lazers attached to their heads

  • Jacob Rodriguez
    Jacob Rodriguez 23 days ago

    I've never seen someone so excited about angle of incidence but It makes me incredibly excited as well!

  • kemp ison
    kemp ison 24 days ago

    Just Mercy also illuminated my mind. Thanks for mentioning it!

  • T110
    T110 25 days ago

    Got an ale elk physics test on this tomorrow

  • Jaykoda Cogburn
    Jaykoda Cogburn 27 days ago

    What if you put the shine the laser on the side of the fiber optic?

  • Jaykoda Cogburn
    Jaykoda Cogburn 27 days ago

    What if you shin the laser on the side of the fiber optic

  • Oliver Meyer
    Oliver Meyer 28 days ago


  • Pelle0014
    Pelle0014 29 days ago

    Milf oil in the water? The ladies been swimming there before you got there?

    • Pelle0014
      Pelle0014 29 days ago

      Five miutes later: Uh, there's Milf oil in there! That makes it even more fun!

  • Luke Kluthe
    Luke Kluthe Month ago

    Why do you have to where those glasses


    have you noticed he always wears the watch

  • RAWKUS tv
    RAWKUS tv Month ago

    Lots of blind fish and gators 🐊 after this video 😳

  • danteelite
    danteelite Month ago +1

    So one could argue, that Lasers are kinda like... _laminar flow..._ for light.
    That explains why Destin loves them so much.

  • Abenezer Assefa
    Abenezer Assefa Month ago

    7:55 "I'm gonna quit talking"
    *Literally 2 seconds later*:

  • ReeluxX
    ReeluxX Month ago

    Me(While walking away):Just that it would sound way better if you said "optical fibers"

  • Ivan
    Ivan Month ago

    8:20 *shoots him*

  • Afnan Ahmad
    Afnan Ahmad Month ago

    Please Use glasses before the watching this video o_o

  • Jan van Tuinen
    Jan van Tuinen Month ago

    :D I love you man

  • Nictdp :D
    Nictdp :D Month ago

    God those frogs must shut up

  • Rasmon 123
    Rasmon 123 Month ago

    9:06 cool!!! Ypu can see the laser in the pitchblack flying around

  • Masta Blasta
    Masta Blasta Month ago

    Light amplification by stimulated emission of radiation 🤓

  • mgs1398
    mgs1398 Month ago +1

    Why does he need the goggles?

  • Warren Percell
    Warren Percell Month ago

    Very similar to ultrasound used for weld inspection.

  • Legend Narly
    Legend Narly Month ago

    can someone tell me what kind of laser that is?? I want one

  • Nice Guy
    Nice Guy Month ago


  • Yobob
    Yobob Month ago

    I think you'll love Snell's law Destin

  • Che day
    Che day Month ago

    Did 😎destin say... "i even got some milf oil in there" ? 😂😂😂😂😂😂😂😂😂

  • Dustin White
    Dustin White Month ago

    at 12:00 min is that an animal or car behind him?
    to the left of the frame

  • HS Hideaway
    HS Hideaway Month ago

    Anyone else get the willies whenever he put his hand down into the water?

  • Oden Petersen
    Oden Petersen Month ago +3

    > sitting in the dark
    > only source of light is headlamps
    "hey lets stick them in the water"

  • Oliver Heckendorf
    Oliver Heckendorf Month ago

    What about air and vacuum
    Could we find a way to bounce stuff off the top of the atmosphere? If it’s possible, the atmosphere meeting vacuum would probably be too much of a gradient to work.

  • José Villa
    José Villa 2 months ago

    Angle is 44.35° propylene glycol 1.4310 air 1.0003 Critical angle = arcsin(1.0003/1.4310)

  • Robo Highlights
    Robo Highlights 2 months ago +1

    3:20 for a nice sound byte.

  • inferno 601
    inferno 601 2 months ago

    whole video i was thinking please no alligator please no swamp monster

  • Beau Tata
    Beau Tata 2 months ago

    When you do the laser in the ornament, you see a cardioid. I thought that was cool.

  • Dan Soethe
    Dan Soethe 2 months ago

    Could have just used a fish tank on your kitchen counter with no danger of capsizing...

  • Sanjid Rahman
    Sanjid Rahman 2 months ago

    Is it just me or with the dirt particles in the Christmas ornament with the laser it actually looks like a freaking constellation?

  • Friend Deming
    Friend Deming 2 months ago

    This is Fantastic and amazing however be mindful of pointing that laser up in the sky... we as pilots (Instrument student) has gotten hit by those kind of lazers. Interesting to see how this affects us in the cockpit. This is pretty cool though, that's how inside. Except it does bounce in the cockpit which is frustrating and dangerous for us especially when we're on the final approach. Clear Skies, I appreciate both channels.

  • Dustin Harms
    Dustin Harms 2 months ago

    Coming back months later because your enthusiasm and joy always makes me smile. :)

  • Rowlett boy
    Rowlett boy 2 months ago

    Me when fapping 10:31

  • kagdra omen
    kagdra omen 2 months ago

    Smarter every night!

  • Dr Logiq
    Dr Logiq 2 months ago

    11:48 You couldn't do that in the UK, pretty sure it's flat-out illegal to point a laser at the sky, certainly during the day, for fear of potentially blinding an airplane pilot... doing that would land you 5 years in jail. Though I wonder, if you were accurate enough, do you think people on the ISS could see a laser emitted by a handheld laser pointer from all the way down on the surface?

  • Brandon Reed
    Brandon Reed 2 months ago

    That's cool my now my question is what do you do with all of that MILF oil you collected?

  • Cherry Flavored Bleach Mr. Linguini the tubist

    Did he actually just say, "You can tell it's an Aspen because of the way it is,"?

  • Mateusz Czerniawski
    Mateusz Czerniawski 2 months ago

    I have one question: Why you have red googles when you play with green laser, doesnt you need green googles? Nevermind, great video!

    • Brendan Smith
      Brendan Smith 2 months ago

      Mateusz Czerniawski It has to do with the depth of the film on the goggles making the light interfere destructively, thus you won’t see that certain wavelength of light.

  • Kevin Brown
    Kevin Brown 2 months ago

    You can tell it’s an aspen by the way it is.

  • Sheldon Bass
    Sheldon Bass 2 months ago

    Growing up on Florida's Gulf coast, we did a lot of diving-won't forget the day I first noticed my light beam refracting off the underside surface.
    Always love it when I learn a new word, or a different usage of a word I already know-meniscus I was like, "Okay, I know I have a couple menisci cushioning my knee...Google, google, "Oh, cool, a physics term too."

  • FatiTank Drawings
    FatiTank Drawings 2 months ago

    The Ultimate Kawalski Kajak