Geometric Optics: Crash Course Physics #38
HTML-код
- Опубликовано: 7 авг 2024
- LIGHT! Let's talk about it today. Sunlight, moonlight, torchlight, and flashlight. They all come from different places, but they’re the very same thing: light! It’s what makes it possible for us to see the world around us, so it’s worth a close, hard look. For instance, how does light travel? When you flip that switch in the bathroom to brush your teeth, how does light move from the light bulb, to the mirror, and into your eyes?
--
Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios
--
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashc. .
Twitter - / thecrashcourse
Tumblr - / thecrashcourse
Support CrashCourse on Patreon: / crashcourse
CC Kids: / crashcoursekids
We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/3TW06aP
WE NEED CRASH COURSE MATHS
Angelo Thavaratnarajah I second this!!
U goddamn right
3blue1brown in the mean time
Try searching for the youtube channel y mx+c
The guy teach malaysian math but i think it will still teach you something
Btw he speak english
I sometimes watch the videos twice... The first time I just listen and get what I can get, which usually is a broad idea of what the topic is about, then watch it again the second time while concentrating, pausing, contemplating and taking screenshots as necessary
Two helpful hints: Watch with captions and at 0.75x speed.
And pause often to think if needed.
Thank you
1.5 speed with no captions: Badass mode
@@owencoukell388 Ur cool but I don't wanna fail my exam lol
@@owencoukell388 ok
That doesnt really help apart from the pause often part
Why do everyone complain about the speed of her speech? All crash-course videos are like this, it's the whole point to squeeze a bunch of information into a short video.
But it's not possible. People who don't know can't get this so fast
exactly, at least it's not boring as a 3-hour class, and it's the same data but faster and more simplified
Oh come on friends... You can slow down the video by yourself ...
I also felt that it's too fast, but there's way to solve the issue.... They are really doing a good work.
@@symbolofpeace.3846 i definitely agree with you. it's best to fix the problem by fixing ourselves, rather than blame others. crashcourse does really put in a lot of effort, and we should appreciate it, rather than complaining
She was wrong that the image is always upside down for converging/convex lenses. If the object is closer than the focal point, you will end up with a vitual image that is upright.
🖒
Periodt
When you got a science test next and didn’t understand anything in class
If you struggle with following along at her natural speed (to make an information packed short video), I recommend choosing the 75% speed option. It is still relatively quick but much easier to follow along with for those of us that aren't as fast of auditory learners! :)
I personally struggle with holding thoughts more than 15 to 20 seconds at a time. The quick pace of this series is just right to hold my attention, and I feel the amount of information is just right. I have sat through these traditional courses, and after waiting for people who don't understand to ask all their questions I am already thinking of something else other than the subject matter. Thank you crash course.
The Star Wars reference was awesome.
+
I learned and easily consumed more knowledge from this 10 minute video than I did in a week's worth of intense focus towards this exact subject in science class.
If only more ants had umbrellas.
+
Dark Night of the Soul now I understand I was an evil kid
Dark Night of the Soul I.
I did that with other bugs. I wish other bugs had umbrellas too.
I'm so glad this channel exists. It's the only thing apart from my dad keeping me from failing physics.
Why do I even watch these I can only follow them for the first 3 minutes
Pause button. Notebook.
I know cause they are thrash
Slow down and/or repeat
@@kurtpace1545 no u
@@kurtpace1545 they'r not!😭iam surviving high school! thanks to crash course.
I agree. I love the Rogue One and the Last Jedi Prophecy references. Keep up the wonderful work. Yes, I wish they had Crash Course Math also. I could use the math help.
I love the Rogue One reference :D
You know you've watched too much CrashCourse when you recognize that the animation is Scout Finch.
Love it!!! We cover this in Physics 223 but in great detail. Great review!! THANKS!! Keep them coming please!
1:16 Last Jedi prophecy!!! They knew🤔
Great video! Such videos are extremely important to me, as my school teacher is useless 😂 We this I finally got to understand reflection. Very helpful! 😊❤
Thank you for giving the ant an umbrella
great! all your videos are so clear and useful!
THANK YOU THIS HAS HELPED ME IMMENSELY
Turning a blurry world into a high-definition experience... yep, very much an accurate summary of my experience each time I update my spectacle prescription.
This video alone got me through grade 10 optics! Thank you so much crash course!
This video has taught me more than the hours worth of lectures I attended for this part of Physics lol, channel never fails
You guys are amazing this video helped me alot with my physics exam!!!
I like this show. Keep it coming lol... Although I've already done lots of this stuff lol
Great video! I have a physics exam tomorrow and i just not into reading tonight, and thought that this video explain almost everything from my text book! Greater ways to study,
P/s : read that some people thought that the teacher is talking too fast. I think that's not a problem though, some people need to study in a fast way, so they need to make a video no longer than 10 minutes. For those who can't catch up what she is saying (which happens to me too) I recommend you guys to pause the video to digest all of the information in your mind before moving on to another new information.
Have a great day ! ♡
And the animation is so cute!
This was exactly what I was looking for!
I have been waiting for this topic for one year!
I love listening to you 😍😍😍 so much to learn 😍😍😍
Awesome job!
Thank you so much, this really helps me.
really helped me understand! thanks x
This was the first crash course physics video I could keep up with first go
Thanks so much 💙
0:21 Love the Mirror Master appearance.
great explanation!
They just had to use the rogue one reference which made my night 😂😂😂
OMG I thought that robot was wacking it for a sec. 0:56
lol
Dylan T u have a dirty mind
@Idon'tgiveafuckaboutanythingH Lol u have it too...xD
SAME
it’s K2SO!
i had to watch this on my online class 😭
Im doing that now :)
I've never tried noticed that straw illusion, one day I'll have to give it a try... maybe right now.
This is very helpful thank you
You did very good!
5:23 focal length of lens depends on refractive index also ... the relation given there is that of a mirror.
I LOVED THE MIRROR MASTER REFERENCE!
So helpful for revise 🤗🤗thank u
Really informative video!!!!!!!!!!!!!
The whole point of "Crash Course" is that it is presented in a "crash" of information. The whole reason why it works is as a supplement to proper lectures, or with liberal use of either the pause button, or the replay button. This has been true since the beginning of this channel. - verdatum
A good thing to start a day
she has a good pronounce in English
and we have to slow the speed to understand it
actually the correct pronounciation make it difficult for me but still i can understand the way of teaching.
and i can understand everything about light in this video
That unfinished 5x5 always distracts me ( the cube, ppl)
Crash course is my favourite channel 😍😍😍😍
Bombed my first optics test so I'm here XD thank u
Thank you so much for this video, it helped me a lot! But it would be better if it was a little bit slower because it was kind of difficult for me. Otherwise the video is good.
Have a nice day !
great video! :D
Thanks!
Appreciate, I have an astigmatism. Thanks.
The angle is the result of crying, then a promise. Side rear mirrors are based on this theorem.
cc is a life saver
Exam in two days, this is on it and this really helps Thanks.
Thank you so much... You saved my life... Wonder Woman 😍😍😍😍
Wish I'd had this resource when I was first learning this :*D
CRASH COURse MATH PLEASE 😢😢
now that we have CS , MATH NEXT!!😣
...btw, thank you for CS 😊
now I'm wondering if optometrists know as much physics as engineers...
I was thinking the same thing! They must know something about all of the lenses they switch in front of my eye. Probably not as much as engineers, but they must know stuff about light and lenses.
Optometrists do have to take physics! They then specialize differently than engineers.
She is a wonderful teacher that makes the topic very clear.... She is flawless..... Love crash course physics because of her. Thanks
Awesome
I loved the Mirror Master reference
had a test about this last monday. wouldve been really helpful :(
aw
exams lul
The infinite Rey pun has so much more meaning now !
Thank you Very much Mam😊😊😊
Will you guys do an episode about shadows and darkness ?
At 7:02 you stated that convex lenses always create upside down images. But don't they create erect ones if the object is with a focal length of the lens?
You guys should do a series on marketing ... Great vids
0:47 is looking more likely every day
umm....isnt the magnification for lenses v/u instead of -v/u in general...
also i think the sign in the lens formula is wrong.
What’s good is that you can go back and listen again if you get distracted compared to skl Lol.
You Saved my Literally
I'm soooooooooo glad that Shini went slow this time. In the videos on electricity, magnetism, electromagnetism and Maxwell's equations, all she did was show equations at a breakneck speed.
want a lesson for separation of compound in mixtures
and composition of a mixture
hang on, doesn't convex lens form a virtual image when the object is placed between focus and pole?
i got lost at reflection and refraction when its already like my third time learning and two exams of that topic
Thank you very much. There are some of them 1; 17; 15; 25 I want the rest of the episodes translated into Arabic.
Cool!!!
This video taught me more than my physics professor in a month
What my teacher couldn’t do in ten weeks, crash course did in less than ten minutes
Do you have any videos about convex and concave mirrors?
Question: for the last two sentences, she said that if the "image is upside down like in our converging lens, then the height is a negative value. And the ratio of the image distance to the object distance is also negative" If the equation is m [magnification] = hi/ho= -di/do, then how can this be true?
If the image height is negative, shouldn't the image distance to object distance be positive to maintain the original equation?
You are correct that magnification can be shown from height and distance, but your formulas are incorrect. For height, it is: -(Object Height/Image Height). And for distance: -(Object Distance/Image Distance). Therefore, both equations are equivalent.
Isn't it a concave mirror is the converging lens while the convex the diverging? I'm confused.
Is there a mistake at 3:15? Says the higher the index of refraction the smaller the angle, shows the opposite.
So, how do you calculate "Dioptre"?
nice
7:03, not exactly true as a convex lens can produce a virtual image which is upright.
In terms of Real Images, she is correct.
Do tell me if i have my fact wrong but it's
1/v-1/u=1/f
in my book and getting confused now cuz even when i googled it ..but most of them consented with mine but some of them had that formula too ...😐
This formula is correct...
But,, it's called lens formula..n it's applicable to spherical lenses...
N mirror formula is:
1/v + 1/u = 1/f
Do nọt like the speaker's way. Crazy
CrashCourse should do a Crash Course to how you make Crash Course.
i cannot see far that good, so I need glasses. when i watch to far away via mirror near me, why isnt the image clear? as light comes from reflection on mirror
crash course: the only thing that is stopping me from failing my class homework
Nice voice good vid
The info box at about 5:30 is wrong. The focal length is half the radius for mirrors, not lenses. The lens formula is more complicated