Object image and focal distance relationship (proof of formula) | Physics | Khan Academy

[@gavrilovskid]

can i just say that this got me an amazing grade on my physics lab. THANK YOU KHAN ACADEMY!!!

[@pseudohawk1656]

Thanks a lot!!! this helped me a lot in my exams. I really want to meet you one day!

[@zalida100]

Cool. Well explained. Still a bit tricky to follow the cursor when you are pointing to something. A bigger (more obvious) cursor would be easier to see where you are pointing. Very enjoyable stuff though. - Thanks V much

[@MrVHI123]

WOW! It's so magical seeing you proving a formula... but anyways, how do the scientists actually found out this equation????

[@fleshcookie]

Sal's really freaking good at math

[@rohansahni9701]

That's why he is known as the Messiah of Maths :D

[@The2Skiing]

Thanks for the ways of this formula originally come from

[@griftorifto2]

Well your videos absolutely rule! Their so so good

[@silent_7x]

Lines thanks it helped

[@fatmahuseynli2424]

You are a great man !!!

[@diwangislucky]

Awesome！

[@hankhannab]

the focal length is half the radius right?

[@boggy6082]

10 years later it’s still useful

[@fatmahuseynli2424]

I don't even know English well But I understand you More than my teacher🙈

[@Tekkpg]

Are focal distance and focal length the same thing?

[@jksloves2edit]

+Tekkpg yes.

[@fcfdroid]

Oh my Cod! This Guy has a math mind! O.O

[@jackward1771]

Anyone know why the focal length has to change to see images that are further away. I'm talking about in your eye

[@fourlegged_chicken]

now i understand that formula... 1/f = 1/u + 1/v

[@86753090811]

voice reminds me of charles...ctfxc

[@MariaMaria-wf7jl]

Süper

[@stankina1]

75,000 views, 10 comments, wtf. Anyway, can someone lucidly explain how we determine the focal point and length?

[@yashn250]

edumantra sanjeev sir but I don't think that you will need it now after 6 years

[@axomiyalora5874]

2018.........

[@Kenza1996]

isnt the image at the start virtual because its behind the mirror.

[@masons2442]

These are lenses

[@akulmaheshwari8880]

2018?

[@emmanueleyob2297]

Who's here in 2017?

[@DECENTBoY]

Emmanuel Eyob Hahahhaha 😂

[@shreyamazumder574]

Means????its 2018😅😅

[@sagestation7831]

Yo... skip to 11:30 and your brain will explode