> temp > à-trier > 3-experiments-with-light-you-can-do-with-your-hands-it-s-okay-to-be-smart

Can You Bend Light With Your Finger?

It's Okay To Be Smart - 2018-04-03

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The other day I got bored and noticed this weird thing happened when I held my finger up to my eye, so I had to science it and figure it out! Let me know if you try these light-bending experiments too, especially that last one that I can’t quite explain yet…

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It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D.
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Writer: Joe Hanson, Ph.D.
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It's Okay To Be Smart - 2018-04-03

The best wizards are scientists.

Try these for yourself and tell me what you see! Think you can explain the last trick? I'm interested to hear what you think…

Capricorn1998 - 2018-05-04

Things I know of that can bend light (change in refractive index) : temperature differentials, pressure differentials, differentials in field density (gauss), velocity of the light source. Electromagnetic retardation should not be overlooked.

Ian Draws - 2018-05-12

It's Okay To Be Smart 💡

PRdeSO - 2018-06-06

Joe you're a really cool teacher.

Daniel Beaird - 2018-09-09

I think the last trick is because you've smushed different layers of shadows into a tight area making them more noticeable than if it were just a big shadow in the open but you can see this by observing the outside of a shadow it will later itself from darkest to the center and lighter towards the outside of the shadow

gyozakeynsianism - 2018-10-10

The worst scientists are wizards, though.

Tanishq Kashyap - 2018-04-03

Am I the only one who did all of these things before( accidently/outta nowhere) and wondered why it happened.

killer queen - 2018-12-23

Nah uh

Marguba Aktar - 2019-01-09

No I am the one who do this and I am just a kid I have done this 342 million years ago! And this video is just realised 9 months ago 😼

N SV - 2019-04-02

Nope

Abdul Haseeb - 2019-06-28

You are not alone

OrionTheWildHunt - 2020-03-11

nah i wish i made the historical disovery first tho

binky2819 - 2018-04-03

1:46 For the next experiment close one eye and look at something bright thats distant

Me: how about the sun?

Joe: NEVER LOOK AT THE SUN

Anthony Stone Murphy - 2018-04-20

Did you look directly at the sun later?

Blaise Requina - 2018-04-30

I look at the sun at a long time sometimes

Mason Silvers - 2018-12-05

@It's Okay To Be Smart i laughted so hard when i saw the never look at the sun part and the more you joe.

Nathanial Oakes - 2019-03-01

no Suni is not bright enough how about an asteroid that from earth is brighter than Suni. : )

Uni Land Multi - 2020-01-10

@Red Salmon Not anymore there is a blanket

Ivan Bolatti - 2018-04-06

I love what you did with #3. You didn't just repeat what's in textbooks. You questioned it. You are a true scientist.

Ivan Bolatti - 2018-04-13

You're most welcome, my enigmatic friend.

battleforevermore - 2019-12-23

or a flat earther

my opinions are facts - 2018-04-03

Me strong. Me bend light.

Ethan Schaefer - 2018-04-04

okay kevin

Nick Crompton - 2018-05-04

Narbadeshwar Singh ur granny a tranny

Mr. J_Krr_ - 2018-12-26

@altermate person I did... You didn't get the joke hidden deep beneath my reply.

DannyDaDuffyDucking Daffer - 2019-02-28

Water stronger

Andy the gamer - 2020-01-10

@Mr. J_Krr_ its a joke

Albe Van Hanoy - 2018-04-03

AND DO NOT LOOK AT A LASER EITHER.

Sven van Crombrugge - 2018-04-04

Depends on power and wavelength, generally speaking it's a good idea though.

Hayle Near - 2018-04-12

i keep looking at a laser because i am mesmerized of the little things that wiggles in it do you get what i mean

SomeoneTheSoybean - 2019-02-13

THE SUN IS A DEADLY LASER




Like if you get the reference!

DANG JOS - 2019-09-05

@Sven van Crombrugge What wavelength would be safe to look at? Seems like saying don't do it at all is a good rule of thumb.

Annonimoose Q - 2019-12-18

Sven van Crombrugge I figure that at the point where it’s safe to stare at directly, it’s not really a laser anymore 😆

Forty Two - 2018-04-03

Hats off to your creative content! We hope that we will get this good in future!

Srdjan Cavic - 2018-04-03

Cool video guys!

Andrea Rodgers - 2018-04-03

Awesome videos, i love your channel you will become big as It's okay to be smart!

Alex Rodeo - 2018-04-03

It's Okay to Be Smart is the best channel..

Kidzor Mrmkarovic - 2018-04-03

wow so many likes

Masteric D - 2018-04-13

Lol no one realize the first maker of this was The Action Lab.

Ksusha Inchakova - 2018-04-03

For some reason when I just looked at picture with butterfly I thought it would say “Stay Ridiculous”.

It's Okay To Be Smart - 2018-04-04

You can do that too!

Shreya - 2018-04-03

What did the light bulb say to the switch?





"You turn me on."
Edit: ik lol sorry

Kevin Benoit - 2018-04-03

If I’m the light switch, it’d say “you turn me off”


Jk my gf loves me lol

Chris P Bacon - 2018-04-04

Your jokes are better than mine cuz everytime I make joke everybody thought that it was so funny that they forgot to laugh ._.

CL Melonshark - 2018-09-14

Knew that was cumming

SomeoneTheSoybean - 2019-02-13

That's the greatest thing I've read all day

Xtreme Games - 2018-04-03

I asked this in September in one of your videos. Probably just skipped over it.

It's Okay To Be Smart - 2018-04-03

Really?! I definitely did not see that. Glad you finally have an answer!

György Mohl - 2018-04-03

2:24 No, not a wizard yet. Four more years. :D

Ezekiel Briones - 2018-04-04

György Mohl :((

A. Neufeld - 2018-04-04

György Mohl You lucky son of a wizard, you got an acceptance letter didn't you? Still waiting on mine, it seems the post is backed up about 11 years...

György Mohl - 2018-04-04

Yes. They said, with my qualification and earlier studies i'll go straight in the place of the principal. Will get that fancy cloak and hat too.
Will arrange your letter when i'm there, sir!

lina - 2019-06-12

I got one for my birthday this year! Oh wait..... I made that letter... :(

Ishaan Sharma - 2018-04-03

Did all this in my childhood 😊

Ryan Martinez - 2018-04-03

Ohhhh... This whole time I thought my eyesight was bad. Now I know everybody does this.

My M8 - 2018-04-04

This means everybody eyesight is bad (☞゚ヮ゚)☞

AaronThePerson - 2018-04-05

lmao i have glasses

CozmicK G - 2018-04-03

I think I can explain the last trick.
If you make a pinhole (for example with your fingers) and look through it against a plain bright background, you can see a weird pattern emerge. It has spots and smudges in it. This may be caused by imperfections on your cornea and in your lens and vitreous/ aqeous humour. I'm not sure what causes the pattern, but it looks organic so that's my best guess. So, when you look through a slit, you're basically seeing this image repeated in a line. This causes the spots and smudges to be stretched out along the slit, making "lines" appear. Idk this is just my first guessplanation based off of about 2 minutes of playing around.

EDIT: Ok, I'm almost certain this is the correct explanation, since after blinking the pattern changes. This means that the pattern is a shadow of imperfections on your cornea, exactly where the spot of light passes through. Also, I tried gradually reducing the slit to a pinhole and sure enough I saw a single image of the pattern emerge. When I let the pinhole expand back into a slit again, I saw the single image get repeated continuously into the line pattern.

oledakaajel - 2018-04-05

TIL my cornea is perfect.

Samerator - 2018-04-06

Explain why it forms on the camera screens

Jonathan Schaffer - 2018-04-12

when looking at this text while through the smallest pinhole i could make with my finger, focusing on the pinhole itself instead of what's through the pinhole caused the text to shrink

Redy1snacc mf - 2018-05-12

CozmicK G
LOL. I just thought it was my eye lashes.

nineball039 - 2018-06-06

A camera could eliminate a lot of the conjecture posted in this thread.

Albe Van Hanoy - 2018-04-03

"The More you Joe"
My new favourite gif.

Khai Quan-Nicholls - 2018-04-04

Thank you so much. I’ve wondered all these thing since I was six!

Subparanon - 2018-04-17

Been doing this since I was a kid. You forgot the most useful aspect of using your fingers to bend light, eyeglasses. You know how when you step down the aperture of a camera lens, it brings more of an image into focus? You can do the same thing with your fingers. If your eyeglasses aren't within reach, and you need to sharpen your vision, you can hold two fingers close to your eye and look between them, as you bring the fingers close together, just before they touch, you are blocking most of the light that is arriving off axis, IE the "blur" leaving a narrow, and SHARP slit of light that you can then easily read text sharply with. It also works with just one finger, if you look out past the edge of it, objects near the edge will become sharper.

Jess - 2020-01-11

I read the title as “Can you bend finger with your light?”

Feynstein 100 - 2018-04-04

"Speaking of......." I'm surprised Techquickie hasn't copyrighted that line yet.

Rebecca Del Santo - 2019-10-21

"Look at something across the room. Preferably with a straight edge"

me withought glasses help it looks like a blub

Ayush Nadiger - 2018-04-04

If u bring two index fingers together it makes a sausage

Maximo Kuri - 2018-04-03

1:38 did anyone else think about the hero “13” from my hero academia? Also, yeah, I get it. You could ask 13 joe. XD


Ps. Was your name joe? I don’t remember, I’m bad with names. XP

TheGamer2554 GD - 2019-08-05

Most people in comment section: thank you, you answered my childhood question
Me: i never thought about that

- { Nay } - - 2018-04-03

2:23 "You're basically a Wizard now. Bending Light... AND bending Dark."

I KNEW IT!

#UnfortunatelyNot

S1B1C1 - 2018-04-03

0:56 i used to do this as a kid, and it felt like magic, i'm glad someone actully talked about it.. Finally YAY

Șerban Andrei - 2018-04-03

I thought that I'm the only one who does those, all of them xD

The Science Lab - 2018-04-05

Șerban Andrei that guy is right inside my mind

Blaise Requina - 2018-04-30

Me to

Juan Garcia - 2018-04-03

2:22 “You’re basically a wizard” YOU’RE A WIZARD JOE

PixelDesigns - 2018-04-03

I would do this in class and be amazed but I never knew I was bending light itself. Such a genius

Somethingsomething - 2018-04-03

the last on definitely have something to do with the eye. for if i move my eyed with my other hand the lines more correspondingly. second making the slit smaller and holding it right in front of your eye gives of an image of for example your eyelashes,

Try this use a bright light like a lamp. hold finger as close you can your eye without touching. make the slit as small as you can see the levels of detail change. move your eyelid with your other hand voila. or slight touching your eye on your eyelid as well there is two things here.

Yassin Almohtadi - 2018-04-04

8:25
Mode Linus Tech Tips Activated

Long Live Planet Awesome - 2018-04-03

This is so cool. I was just doing my physics homework when this video was posted. The chapter I was reading was about light.

Dodoraptor and other animals - 2018-04-03

2:23 yay!!!
I can finally go to Hogwarts!!!

CobaltMusketeer - 2019-02-15

2:10 I realized I knew how to do that before watching this video.

Jurbimus Perkules - 2018-04-07

"dont look at the sun" *puts a picture of the sun onscreen *

Dustin Harms - 2018-04-05

Lol'd at "The More You Joe"

Really great episode.

Mason Silvers - 2018-09-17

1:51 onwards till the more you joe thing i laughed

Scott Powers - 2018-04-03

as I see it, one line between your fingers is caused by the edges of the penumbra overlapping but because it is out of focus, it makes multiple, slightly off center, images on your retina so you see the line caused by the overlapping of the edges of the penumbra multiple times. (copyright Scott Jeffrey Powers)

בניה בר-און - 2019-09-26

"the more you Joe" made my day

avi12 - 2018-04-03

1:58 Somebody, make a meme out of this please

n ziom - 2018-04-03

I was doing this in my childhood ahhh good day's (lol)

someone7656 - 2018-04-04

2:38 FINGER GAP SHAMING, DISGUSTING

Isa - 2018-04-11

I used to try this when I was little, looking between my fingers helped me to see better.
So cool hear you talk about it, great video 💕

Yassin Almohtadi - 2018-04-04

0:16 We should ask captain disillusion to explain how did you do this trick

It's Okay To Be Smart - 2018-04-04

FLAWLESS SPECIAL FX

Yassin Almohtadi - 2018-04-04

LOL

Herp Derpingson - 2018-04-04

Back when I was a kid I asked this questions to my physics teacher. He said I was imagining things.

Now, I finally know.

Josh K - 2018-12-06

1:51 The More You Joe 😂🤣😂

Aniket Adarsh - 2018-04-04

bro!
this shadow blister effect has boggled my mind for almost 8 years...

TheyCalledMeT - 2018-04-03

love your nerd jokes! :D
edit: damn .. that was awesome! love how fascinating so simple stuff can be.. thanks for the reminder!

ExChro - 2018-04-03

The more you Joe----

Hmhm i Just laughed for 20 minutes only

fightmeirl - 2018-04-03

i remember when i was very young sitting in a car, i stared dead at the sun for the longest time, i was trying to focus on the center.

Moamin Aljaro - 2018-04-03

that moment when you realize that you're a nerd when you laugh at science jokes