Virtual image | Geometric optics | Physics | Khan Academy

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  • Опубліковано 29 лис 2024

КОМЕНТАРІ • 121

  • @madhusai220
    @madhusai220 6 років тому +88

    I'm really impressed with that face...

  • @zmail8566
    @zmail8566 8 років тому +181

    "And remember, all reality is just a big simulation going on in our brains." I love this guy.

    • @WalkAbout28
      @WalkAbout28 7 років тому +4

      Remember that for your test tomorrow

    • @CristianDiaz-tg1pj
      @CristianDiaz-tg1pj 6 років тому +3

      That's really tripping tf out... now I can't graduate.....

    • @CristianDiaz-tg1pj
      @CristianDiaz-tg1pj 6 років тому +1

      tripping me*

    • @mrmeeseeks2634
      @mrmeeseeks2634 5 років тому

      *Elon musk has entered the chat*

    • @frankmars4259
      @frankmars4259 4 роки тому +1

      It means like the brain inverts the image formed on the retina.
      Image formed on retina is inverted.

  • @jamesace3273
    @jamesace3273 8 років тому +206

    Do you also teach Art because holy crap that face looks amazing and u did that like what 5 secs hahaha.

    • @raymondnucuta7982
      @raymondnucuta7982 5 років тому +2

      Exactly what i was thinking lmao

    • @srinivasar4852
      @srinivasar4852 5 років тому +7

      And then he throws another bomb a second later!
      "All of reality is just a big simulation going on in our brains..." he says, nonchalantly. 😶

  • @fleshcookie
    @fleshcookie 11 років тому +60

    Sal makes drawing that face in about 5 seconds look way to easy. Try drawing it yourself. I tried to copy his it took me 10 times as long and doesn't even look as good.

    • @m3lezgnz829
      @m3lezgnz829 6 років тому

      proof that MIT math graduates are really brilliant

  • @tomazlm_
    @tomazlm_ 12 років тому +7

    "..and remember, you know, all of reality is really just a big simulation going on in our brains". He's totally amazing.

  • @angiiedee
    @angiiedee 12 років тому +13

    LIFE SAVER! I love how you have trouble drawing straight lines, but then you draw the person and it's perfect first try! So funny :p I wish I was an artist!

  • @sebasrm1
    @sebasrm1 10 років тому +80

    I stopped paying attention when he was drawing that face there.

  • @WatchJacquelyn
    @WatchJacquelyn 12 років тому +4

    Why was that face drawn SO skillfully....

  • @goku1863
    @goku1863 8 років тому +23

    "Our brain creates a model of this image or whatever."
    - Sal Khan

  • @nonlkyonis6360
    @nonlkyonis6360 11 років тому +7

    He is an artist as well; respect! I agreed with you.

  • @cheesypeesy2
    @cheesypeesy2 13 років тому +3

    That reflection of the eye was really cool, never thought of how things reflected.

  • @Doivid_
    @Doivid_ 2 роки тому +2

    Was anyone else extremely impressed with Sal's face drawing?

  • @Tarteel97
    @Tarteel97 12 років тому +3

    i dont understand how drawing a face is so easy for him but drawing a line is the most difficult think ever :P good job tho

  • @ThomasTJDavis
    @ThomasTJDavis 10 років тому +30

    "Now all reality is really a big simulation going on in our brains" ---The Khan Guy. Physics and Philosophy today, is it not?

  • @jontymcj
    @jontymcj 12 років тому +4

    "And remember, all reality is just a big simulation going on in our brain" Getting philosophical up in this shit hahaha.

  • @liamdarcy4115
    @liamdarcy4115 7 років тому +11

    1:56 sal why did you have to do that

  • @michaelhaggerty569
    @michaelhaggerty569 6 років тому +4

    this is the best explanation online ... killing it as always Mr. Khan!!

  • @rubinayesmin3126
    @rubinayesmin3126 3 роки тому +2

    If there were placed before that mirror an object unlike anything the brain has ever seen a real image of,will it still be able to simulate a correct virtual image?

  • @imkaneforever
    @imkaneforever 12 років тому

    'all of reality is a big simulation going on in our brains" whoa.

  • @keaganhurter2550
    @keaganhurter2550 2 місяці тому

    1:55 "And remember, reality an illusion, the universe is a hologram buy gold, bye!!!!"🔺👁

  • @jerometetle4564
    @jerometetle4564 10 років тому +2

    I feel like I have all the answers, just not in the correct order until I watch your videos. Thanks so much!

  • @Atheres99
    @Atheres99 13 років тому +1

    a real artist!

  • @phillballs
    @phillballs 3 роки тому

    sal you're crazy bruh man just drew a perfect face like it was nothing

  • @rajivsaxena7111
    @rajivsaxena7111 9 років тому +1

    if only one light ray is coming from that arbitrary point as u said and after incidencing on the mirror if the reflected ray is produced backwards will it still form the image or not

  • @Clubmeber2869
    @Clubmeber2869 11 років тому +1

    Wow!!! Best explanation of a virtual image yet :D

  • @LAnonHubbard
    @LAnonHubbard 14 років тому

    Is it possible to shine a light into a structure that has mirrors pointing to mirrors, etc, etc and for the light be trapped - continually reflecting between the mirrors?

  • @obanr
    @obanr 12 років тому

    3:53 i think you should clarify that it's not being emitted from "behind the observer".
    otherwise, great vid. very helpful

  • @kyloshalo6440
    @kyloshalo6440 9 років тому +1

    Thanks guys that's cleared it up a little

  • @sumathyprakasam7248
    @sumathyprakasam7248 3 роки тому

    Holy crap that drawing of the face looks like a chefs kiss

  • @christianraiz8179
    @christianraiz8179 11 років тому

    you've almost penetrate the confusions in my mind

  • @Georgiiaxx1
    @Georgiiaxx1 11 років тому

    wow this really helped me for my physics exam, as did your other videos!

  • @samuelsmithmed214
    @samuelsmithmed214 5 років тому

    Sal "all of reality is a simulation in our brains", he went deep on this one

  • @maira893
    @maira893 13 років тому

    great attempt .best than all other demonstrations.great job

  • @zbe8
    @zbe8 14 років тому

    @LAnonHubbard No, mirrors absorb small percentage of light every time they get hit and at light's speed...

  • @SajiSNairNair-tu9dk
    @SajiSNairNair-tu9dk 4 місяці тому

    God is reflect knowledge 🤔😊

  • @sakshichandak9250
    @sakshichandak9250 10 років тому

    thnxs a lot u helped me a lot for my science exam!!!

  • @karan6160
    @karan6160 4 роки тому

    sal sir I REALLY LIKE WHAT YOU DO

  • @boeing747200lr
    @boeing747200lr 14 років тому

    Sal, just a thought that came to my mind. Total number of videos in the library are nearing 2000. We are nearing year end 2010. Wouldnt it be awesome co-incidence to have 2010 th video on 31st December 2010 and 2011th video in year 2011.

    • @Sohlstyce
      @Sohlstyce 3 роки тому

      that would've infact been awesome. the real question now is are you still here on youtube (this comment is just a year less than my age.)

  • @Hino_55
    @Hino_55 4 роки тому

    Great Explanation Sir Sal! Thankyou for this!

  • @sadafshefa2285
    @sadafshefa2285 5 років тому

    Hahahah "Of course the light is not curvy like that" Love it!!

  • @MatesMonchis
    @MatesMonchis 8 років тому

    Amazingly explained. Thanks a lot.

  • @benjaminajclayton
    @benjaminajclayton 12 років тому

    thanks that is really helpful for my physics gcse

    • @na092
      @na092 4 роки тому

      ThatMathematicalEngineer how’s life

  • @rahul7090
    @rahul7090 9 років тому

    Thanks ! Sir, I actually got this concept which was too hard for me to get....

  • @Weeeooojr
    @Weeeooojr 13 років тому

    Wow, you draw really well.

  • @mehakmiglani9658
    @mehakmiglani9658 11 років тому

    So helpful. Thank you so much.

  • @Vorbis5
    @Vorbis5 14 років тому

    Whoa, that was a beautiful face you drew. Man, you are perfect.

  • @thomashaile9113
    @thomashaile9113 5 років тому

    Thank you this helped a lot

  • @prakashdahal8975
    @prakashdahal8975 5 років тому

    thank you very much best video

  • @Tiaranatt
    @Tiaranatt 12 років тому

    What program did you use to make this video?

  • @dozii5
    @dozii5 7 років тому

    Thanks, Sal.

  • @ramish1995
    @ramish1995 8 років тому +2

    can the book diagram be represented in the same was as the "eye" diagram?

  • @AnIcyTruth
    @AnIcyTruth 13 років тому

    The orange is a lie!
    Very nice, very clear. Thank you.

  • @romancasco
    @romancasco 13 років тому

    what a great explanation!

  • @abdu841996
    @abdu841996 13 років тому

    thx bro it helped me alot

  • @Happy1993Life
    @Happy1993Life 12 років тому

    he is totally amazing

  • @antikasharma5734
    @antikasharma5734 5 років тому

    Nice experience

  • @Magmatwister
    @Magmatwister 14 років тому

    Thanks

  • @freyasouter5329
    @freyasouter5329 8 років тому

    thank you again!

  • @yami9977
    @yami9977 10 років тому

    I think images in mirrors are flipped front/back not left/right

  • @joshlai409
    @joshlai409 6 років тому +1

    "THAT IS A MIRROR." I was thinking in perspective of art student lol, no it's a line lmao

  • @S2PEducation
    @S2PEducation 12 років тому

    thank you

  • @gerpunker
    @gerpunker 14 років тому

    Cool!

  • @niveyoga3242
    @niveyoga3242 6 років тому

    My Picasso cannot draw a straight line, but a perfect face in 5 sec!

  • @palak6981
    @palak6981 4 роки тому

    Sir, but the magenta ray is not falling into the eye.

  • @rajmbhatt
    @rajmbhatt 8 років тому

    Awesome video

  • @siri8221
    @siri8221 5 років тому

    Awesome

  • @lassiezaffre1686
    @lassiezaffre1686 11 років тому

    I know right

  • @inneruniverse17
    @inneruniverse17 14 років тому

    @NollieSk8 No. You missed. D:

  • @Acts2Missions
    @Acts2Missions 13 років тому

    well

  • @kameray2230
    @kameray2230 6 років тому

    plane mirror always form virtual image but when we reflect sun's rays on a wall we get a real image that can be obtained on screen such as wall . how this is possible? kindly clear my dout.

  • @LAnonHubbard
    @LAnonHubbard 14 років тому

    @zbe8 Thanks for the answer.

  • @1.4142
    @1.4142 2 роки тому

    optical illusions

  • @TheDevilvivek
    @TheDevilvivek 13 років тому

    real image can be touched

  • @PartVIII
    @PartVIII 14 років тому

    i

  • @anoirtrabelsi8645
    @anoirtrabelsi8645 11 років тому

    Those who put dislike !! You have to be blind !!!

    • @kuchinawa27
      @kuchinawa27 8 років тому

      Jon Snow you know nothing

  • @learner-ip4fy
    @learner-ip4fy Рік тому

    🤯🤯🤯

  • @Astro-X
    @Astro-X 11 років тому

    Bahahaha I was just about to say that... But so true!! XD

  • @mythic971
    @mythic971 3 роки тому

    all reality is just a big simulation going on in our brains huh didn't know that I thought I was real lol
    jk

  • @boeing747200lr
    @boeing747200lr 14 років тому

    @NollieSk8 Damn u lucky.......

  • @bravopenguin7642
    @bravopenguin7642 3 роки тому

    American excel!

  • @eliyohu123
    @eliyohu123 11 років тому

    Why is the sound so horrible that I can't hear normal words?

  • @LAnonHubbard
    @LAnonHubbard 14 років тому

    @sexysadman If you were to key 95/1550 into Google, it'll tell you the answer.

  • @haileyy2288
    @haileyy2288 8 років тому +1

    theres something wrong with the last part. you broke the law of reflection: angle of incidence is equal to angle of reflection in plane mirror. people might misunderstood that a plane mirror can bounce back to itself but no. you should have drawn a concave mirror to better understand.

    • @haileyy2288
      @haileyy2288 8 років тому +1

      ps. i love your drawing

    • @rayz0rxxx
      @rayz0rxxx 7 років тому

      wat. if the angle of incidence is 0 degree so the angle of reflection is 0 degree also

  • @shayaandanish5831
    @shayaandanish5831 4 роки тому

    So reality isnt real. But that's a self defeating statement

    • @Sohlstyce
      @Sohlstyce 3 роки тому

      what he meant is that the "true" reality isn't really what we perceive as reality

  • @siri8221
    @siri8221 5 років тому

    Great face

  • @inderjeetdandona
    @inderjeetdandona 8 років тому +5

    its so difficult to understand

  • @nafiofarhan1059
    @nafiofarhan1059 8 років тому

    ..

  • @marriyumh
    @marriyumh 12 років тому

    Salman Khan

  • @shiveshskshukla4118
    @shiveshskshukla4118 7 років тому

    aise padhayega to fail ho jayenge

  • @sumathyprakasam7248
    @sumathyprakasam7248 3 роки тому

    U can teach art instead

  • @charliekennedy2203
    @charliekennedy2203 10 років тому +1

    These are great but please stop repeating yourself when you say one sentence

    • @ActuallyAudacity
      @ActuallyAudacity 9 років тому +1

      He is human so he can make mistakes and may sometimes hesitate!!

    • @BritneyFreak34812
      @BritneyFreak34812 7 років тому

      Charlie Kennedy Agh I agree!!

    • @Sohlstyce
      @Sohlstyce 3 роки тому

      @@BritneyFreak34812 can you reply after 3 years?

    • @BritneyFreak34812
      @BritneyFreak34812 3 роки тому

      @@Sohlstyce yes

    • @Sohlstyce
      @Sohlstyce 3 роки тому

      @@BritneyFreak34812 OH WHAT A LEGEND

  • @nonlkyonis6360
    @nonlkyonis6360 11 років тому

    You are disoriented!

  • @preetbajwa9624
    @preetbajwa9624 7 років тому

    I can't able to understand him it's all rubbish

  • @lassiezaffre1686
    @lassiezaffre1686 11 років тому

    I know right

  • @kameray2230
    @kameray2230 6 років тому

    plane mirror always form virtual image but when we reflect sun's rays on a wall we get a real image that can be obtained on screen such as wall . how this is possible? kindly clear my dout.