Physics: optics of lenses and mirrors (2)

[T4zY]

Thank you ever so much, if only there were million more decent teachers like you huh? Then this world would brilliant. You are BRILLIANT! =D

Aren't you really young to cram all this in to your mind? That means your like a SuperHero!!

OMGeeej maynns. Your awesome.

[OOHAJC]

YOU SAVED MY LIFE.

[5dollarwhat]

thanks!! i have two days before this exam and this really gave me a solid basis,

i've also seen some of the organic chemestry movies, I like how you take your time to really study it.

[expertindia2000]

Tell me you're going into teaching please. We need more people like you!

[ForYeensSake]

Haha don't stop believing :) made me slightly happier ^^

[BeanTek]

Don't stop believing! (Love the background choir) lol

[gi0vanepersempre]

THANK YOU

[greent26tube]

Very nice. Thank you.

[Pezan1118]

bloody help this guys a genious

[IntoTheFace]

Youre a REALLY good teacher!

[juliagym13]

this saved me

[naturalfeatures]

Thank you so much, many many times over. I'm taking physics at a university so that a piece of paper says "General Physics, 4 credits" on it, but most of what I've learned about physics has come from watching Walter Lewin and these videos

[Harpysrude]

lol cell phone vibrating... journey playing... dude's blowin' up

[mvorens1]

dont stop believing...best thing to hear when studying for a physics final

[animefreak619240]

physics test on monday. this is my lucky break. thanks. 

[mido1765]

the second ray u drew is incorrect , its suppose to go through the focal point next to the object then through the lens and refract, then go parallel to the principle line...

[FireSoulism]

@mido1765 actually he's still right. He's focuing on a ray that doesnt go through the focal point but instead goes through some other space. He's trying to represent that all light that goes trhough the lens will meet at that one point :D

[Gavlar92]

@mido1765 that's the optional 3rd ray you can draw, they all converge at the same point.

[yoshitoki23]

I thought the arrow was a house for the longest time. -_-

[jeremyslife]

@yoshitoki23 we all did....we all did.

[benja303]

@yoshitoki23 Oh shit it's not a house?!?!?

[xsfxing]

I love this!! I'm in high school and my physics teacher is just... but this is great :) Textbook reading doesn't help!

[joejacksonriley]

Awesome video, thanks!

[TimmysMummy]

Ive just seen on you website all the videos you have for chemistry too. Ill gonna check them out when I get this evil physics exam out of the way next week. A million thankyous four your help, you make me feel like I have a chance of getting through a horrible exam.

[bichtitbob]

at 9:47 did that guy say that they were both on the right?

[20thousandlightyears]

who's awesome? you're awesome! : D

[thai5102]

you are awesome

[foeunit]

where can i find more people like this guy man hes so awesome!!!

[conker690]

These should be in closed captions.

[timabad]

a girl has an orgasm at 10:13 wtf?

[a20e09c]

thank you!



[lizzy201292]

i can hear some one singing songs in back ground i guesss its hindi

thnxx alott for vid

[Sonneybouy]

My friend posted this on facebook for revision practise for physics. Prepare for this video to go viral- this is gold dust, seriously thank you sir.

[GAMEFREAK333]

You sir, are my hero. I might just pass my test tomorrow. If I ever get some money of my own, I will send you some.

[544001]

very helpful video, thanks for the upload

[jc55]

So it is possible to have a convex lense that doesn't converge light rays? So in the second diagram he was drawing at 5:00 doesn't strictly have to be a concave lense?

[sean14916]

A convex lens by definition converges light. The difference between the two diagrams is that the first one had the object distance greater than the focal length of the lens whereas the second one has the object distance less than the focal length. In the second diagram (o less than f) the image is a virtual image. It's not really there, it's an illusion. When o greater than f it's real and the image is there. You can project real images on screens. Virtual images can't be projected on screens.

[ryanguy6789]

Nice vid. loved it.

[starlessartemis]

it's right. he just skipped the 3rd line which goes to the focal point and refracts/reflects bk parallel to the ground.

[MuzeTV]

THIS guy is wrong about the convex lens, it shouldn't go through the center of the lens, it should instead go through the focal point, then converge as it hits the lens!

[jimmynguyen1993]

all your videos help SO MUCH i'm currently having trouble in my grade 11 physics class near the end of the semester in this unit

[saurabh588]

hiiiiiiiiiiiiiiiiiiii

[hicelina]

Thank you :]

[TheFabledWolf]

was there a singing of Journey in the background? wow.

[cooperman1878]

@TheFabledWolf uptown girl I think...

[cooperman1878]

@TheFabledWolf uptown girl I think...

[SeniorHankey]

@cooperman1878 Don't stop Believing

[sjb167]

I love you man! there needs to be more people like you in this world

[Mayimbej]

My professor, has rules to drawing the rays.

1st. Draw a straight line from the tip of the object, straight accros, through the focus etc.. Could u state the rules, instead of just drawing the rays that come across together?

[iamdudeinmood]

i'm studying igcse..

this video is really very helpful.

thnk you

:D