Convex lens examples | Geometric optics | Physics | Khan Academy

[@marcochimio]

Very helpful. So to review, if you can, try to draw three rays from your object to a convex lens: 1) one that is parallel to lens (which will refract through the lens to the opposite-side focal point), 2) through center of lens (which will continue straight without any refraction), & 3) (if possible) through the same-side focal point (which will become a parallel ray on the opposite side). So straightforward (no pun intended). Brilliant. Thanks.

[@escape093]

I really wish you were my Physics teacher O__O The one currently (attempting) to teach me about lenses in school is horrible! DX

[@Joseph3391399]

Thanks for posting this! it helps me a lot :D by the way for all the other viewers, change the play speed to 1.25 so it saves more time watching all the physics videos.

[@AndysMusicPod]

Babe, wanna smash ?

[@Biracialcookie]

@@AndysMusicPod ok bud

[@Biracialcookie]

I can barely follow at regular speed

[@daliawalzer8038]

I would die for you sal khan

[@Eric-sq4hd]

no you wouldn't!

[@sandloover]

THIS VIDEO ISNT FANTASTIC... ITS OUTSTANDING!!!

[@trailblazer5389]

LOL the way he says, "If someone's 'eyeball' is right over here..." at 7:39

[@blazzer206]

so does it mean that if i draw one line meeting the focal point on the left, and another meeting the focal point on the right, I would be able to find out where the focal point is?

[@blazzer206]

wohoo!!! thx for explaining this to me! Now i dun hav to study for lenses anymore!!!

[@mathukopal7381]

THANK YOU FOR YOUR SERVICE.

[@fossil98]

Exam in the morning. Eek! Very helpful.

[@saadhabbal9265]

thanks sal saving me from my physics exam tomorow

[@TheSmootherCriminal]

thanks. really helped!

[@jamespyroman]

THIS VIDEO IS NOT SUPERB, ITS #1!

[@sarrahalejaga5103]

THANKS SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@abhayranjith]

Sal Khan, You. Are. Amazing.

[@silviamayo2993]

3:59 I mean technically you could, if you take rotational symmetry into account

[@mohamedalshamari9156]

the example before the last one where no image formed, if the other ray was on the optical axis, will the image be formed?

[@shoaibheesam1577]

How do you know if it's going to bigger or smaller and closer or smaller? Is there a formula

[@silviamayo2993]

With that last example, if you drew a ray right through the middle of the lens, could it be extended back to that virtual point as well?

[@IamJacksColon4]

can you do a video on a concave lens infront of a concave lens?

[@amrqarrain1230]

Wallahi life saver. U just saved me from failing my physics exam

[@guyman8282]

it would be with a concave or convex mirror but since this is a lens it is just called 2f

[@ebubethefriend165]

19:18 "they're going to see a magnified virgin"💀

[@elleryaltshuler5097]

Thank you!

[@brekkyai]

sal khan you are dope

[@lopamudrakar5680]

U r amazing!!!

[@yashkamboj8970]

is 2f also the centre of curvature?

[@LNasterio]

@moizaphenom what you learn in high school will all be repeated in university witin 1 semester. This is to make sure everyone has the same assumed knowledge through out their university course. so yes I was been taught about this in university, but in a really fast phase and mostly concentrate on deeper concept explaination which often confuse new learner like myself.

[@Thegamemakur]

I love u sal!

[@Musicman643]

Great Video!! Just one thing, two rays that are parallel to eachother actually do converge....but at infinity. So techinically speaking the image would be formed at inifinity! :)

[@moizaphenom]

@LNasterio you are taught all this in a university?? im learning this is in 10th grade.

[@DeneuveBrutus]

ALL HAIL DA KHAN!

[@LNasterio]

I cant believe our university lecturer actually spend 4 fking lectures to teach all this, where Khan only spend 9 mins!!!!

[@Wargamer008]

My test tomorrow is gonna feel the Wrath of Khan

[@Sanchitoooo]

YES

[@Mabdul1ah]

how can you tell if it is inverted? real, and virtual?

[@AndysMusicPod]

How can you even think of passing a test

[@karanchothani4443]

u r awesome!!!!

[@sarrachouk4113]

i did not really inderstand why did we put 4 focal lengths?

[@Biracialcookie]

Learning this during quarantine is horrible

[@stopgettingtriggered]

C-C-C-C-Combo ah f*** it, THIS VIDEO ISN'T OUTSTANDING, IT'S SUPERB!