Optical Instruments: Crash Course Physics #41

[@crashcourse]

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

[@bryelop]

Can you do a mathematics series

[@GermanyVsPoland]

Bryson Handy no

[@Guesty180292]

I watched this for the first time a little too drunk to really understand, but I'd like to explain what I learned from this: Nature is really, really smart. Well done natural selection.

[@edgarpastor2706]

Im going to binge watch this Wholeeee playlist as a summer study for 11th grade.

[@kamenwaticlients]

Wow I'm amazed I got all of this. I'm so far removed from my academic days. Thats a credit to the writing, interesting and informative graphics, and most of all the skill and engagingness of the presenter. Well done!

[@TheKjd989898]

me: this looks like something for kids. Ill understand it. *ten minutes later* me: wut

[@markholm7050]

At 7:08, you say, "These mirrors are convex," but the mirrors you are referring to, primary mirrors in telescopes, are actually concave.

[@sid5519]

I am learning optics and I watched 2 Crash Course videos about optics. They were very supportive! Thanks!!

[@andytang4609]

This is amazing! Can we do an organic chemistry course?

[@Eva-vz3ut]

Thank you for being so much nicer and more insightful than my real physics professor. TRULY you are the reason I am passing.

[@travismuhler]

These physics videos are a lifesaver! Thank you!!!

[@RussianShadowStorm]

wow. visual aperture. such reflection. much refraction.

[@abhinavajith92]

At 7:08 you said these mirrors are convex but they were concave. Gr8 vid btw

[@kelly2fly]

I love her accent

[@MJ-zx7hn]

Did anyone else see ET when she was talking about subtending?

[@Izen99]

This is how you teach physics . i just loved it .....

[@vision_invisible]

Great work! I like your pace it is exactly the type of fast action crash review to get rapid conceptual understanding. I'm reviewing 10 per day. I took 1st year physics 20 years ago and I'm not interested in the details, but the conceptual underpinnings. I hope you go right into more advanced topics.

[@hipstergod]

Sheah right like someone can hold a College Physics Book with just one hand in a angle where they could have a page open to read to find out near point

[@RobertNewstrand]

would you do an episode on the physics of radars (for example: weather radars)?

[@vonneely1977]

This video was proceeded by an advertisement for Crash Course. *Crashception.*

[@ekbergiw]

Ceprashashion

[@ekbergiw]

Cepcrashishification

[@ekbergiw]

Crashsepciption

[@8LiterallyJustTheNumber8]

Preceded

[@abubakaryusuf4912]

I SERIOUSLY LOVE YOUR LECTURES AND SHIRT

[@ellmdv]

OMFG BEST THUMBNAIL IVE EVER SEEN

[@alisonyoung4569]

Could you please make a video on the basics of Particle Physics?

[@bcqueso]

Wow much doge. Learned much. Eyes blurry. Takes me back to 2010.

[@moimeme7385]

Very Helpful video since i study some optical physics.

[@ehsanabdusamad443]

nice presentation!!

[@Geeksgod]

nice explanation

[@9_in_the_afternoon]

That moment when you have astigmatism so nothing looks clear 😂

[@jwzj303]

I love it when I see ads for Crash Course when I am actually watching there video...

[@joshhyyym]

5:21 the image used is misleading. Assuming that the lens materials are the same the objective lens should be thinner and have a longer focal length than the eyepiece. The instrument shown would have a fractional magnification. Also, the small angle approximation is only valid when using radians. This would also be confusing to a person trying to reproduce the calculations.

[@farahaltamimi3506]

Do a video about electromagnetic waves and spectrum please

[@cosmechav]

best physics teacher!

[@sunnyboy866]

Great Video. And many thanks for speaking bit slow and pronouncing the words completely unlike previous videos :) Good accent btw

[@nathanzuniga8650]

Shouldn't tan(theta')=Height of the virtual image/focal length of the eyepiece?

[@zuriellara6464]

I agree!

[@thejamesthird]

Me eyesight is better than 20/20, my Optometrist said my eyesight is 20/12!

[@erickmeza5606]

Good video thanks

[@javiermancheno8531]

Thanks a million !

[@PILOSOPAUL]

you took a picture of a *mongrel* you end up with a picture of a *doge* what sorcery is this?

[@big_cuh]

a *donge*

[@alexortegapereira]

YUP

[@sridhanyakomaravolu3819]

Because even if you've never picked up a camera or a smartphone in your life, you're "probably" still using your eyes

[@ashutoshtiwari8187]

Nice video but i think you missed the important derivation of magnification i.e m=V/U(1+D/F) where D is the least distance of distinct vision.

[@MaFe1992]

She IS so freakin beautiful :(

[@Ronnie7X]

the emphasis should be on "so" or "freakin" instead of "IS"

[@alexgabriel5877]

Nope

[@ashboon1625]

Much beautiful. Much Wow. Wow

[@sandrisvirsis6776]

No

[@ekbergiw]

Is she Southern Indian? I am unsure

[@TheRealE.B.]

My near points for both of my eyes seem to be at about 12 cm. But I'm not nearsighted, at least not in my dominant eye. And even my weaker eye seems to be less nearsighted than the eyes of most people who wear glasses. I feel special. Maybe that's why I'm so good at finding four-leaf clovers.

[@Techmania00]

Do you guys have a book i can download

[@jaydupree418]

What exactly is used to absorb photons in digital cameras?

[@frankly9432]

Coooool! I love physics, thanks!

[@marvintpandroid2213]

Pedant here, is a camera the "Reason" we can see you? Surely it is the tool used to capture the video, the reason is something else?

[@Borednesss]

The reason is clearly because of the big bang; or whatever happened before it.

[@afroman8626]

Hey guys, look at the moon at 3:49- Spielberg would be proud

[@OtherDude]

I need a video on tension!!!

[@Nothing_serious]

Wow Such Episode Much Science Very Smart

[@mjohnson5030]

What an excellent video. Engaging and validates all with mathematical proofs. Just one errata: at ~7:20 the presenter incorrectly describes reflecting telescope mirrors as "convex" . Reflectors have concave mirrors. (the post-production test and diagram correctly show convexity). Minor quible. This is college-lecture quality education with practical applications and examples. Subscribe and Like pressed.

[@anandapatmanabhansu]

Thankyou teacher

[@chowtom5174]

1:31 to a physicist: eye, eye, eye, eye, eye. All eyes.

[@xaniel6639]

Such wow! many education. so phisics

[@DNYL_]

*POOFFFTT* That was the sound of my mind being blown

[@wesleytarr6302]

Is it your guy's goal to take everything we learn in highschool and put it into video form?

[@MeIsGurlNow]

Two Of The Recent Videos are not Added To Physic Playlist Episode 40 and 42

[@92AlexanderS]

Optical instruments? Optican approves this message.

[@prestondial1992]

I just got an add for crash course on this video

[@X-3K]

SPECIAL RELATIVITY!!! YUSSS! IT'S ABOUT _TIME_!!! Special relativity is my second favorite x_x XD Yes! I am so unbelievable exited right now. Like, I could not wait for next friday. Like, AHH! LORENTZ FACTORS! TIME DILATION! LENGTH CONTRACTION! DOPPLER SHIFTS!! AHH I legit cant wait. lol

[@FireBucket]

Hope they talk about shadows and darkness.

[@sphumelelesijadu]

Am I the only one who noticed that she never blinked when talking about what we learnt today.

[@jims007]

I want to help crash course by making videos like them I was thinking Math? How to

[@vilaskadival]

James Soe I was thinking Math SUX!!!

[@aanmoon7527]

anybody notice the hagrid on the moon 3:48

[@mechabunny3323]

I think that's E.T, but well done for spotting it.

[@Bobherry]

Do another medical series

[@Raziffalyan]

Where's the #40 episode?

[@Belbecat]

Lol, people hating but the doge is the only reason I decided to watch this video xD

[@jearbear]

Don't forget about astigmatism

[@flutterg1035]

1. I woke up 2. I gained friends 3. I got a new puppy 4. I won the lottery (read in the order of 2, 3, ,4 ,1) the first comment I saw of this was from a person called Rhea Recai if your going to copy mention them plz I want to see it spread

[@FireBucket]

flutter grace nice to see credit where credit is do

[@VittamarFasuthAkbin]

and whats so special about that comment?

[@flutterg1035]

Vittamar Akbin its cleverly put together

[@VittamarFasuthAkbin]

I think it is just "meh". Why not read it 4,3,2,1? It is not that clever if other arrangements make the same sense.

[@flutterg1035]

Vittamar Akbin how about you make one yourself and our own way :3 also its read that way to trick you you think it would be 1,2,3,4 but its 2,3,4,1 both tell a different story also the biggest thing is last cause in dream when something really good happens you generally wake up after

[@forget112cv9]

I'm a simple man, I see doge I click.

[@altair5953]

Nice thumbnail...such dank meme.

[@BobMcCoy]

How can you not click on the doge

[@tidepod5420]

i dont get it :(

[@josephcrossley9513]

Sorry for taking your opia Shini. I will give it back as soon as I can.

[@dheer369]

Did anyone notice the man riding a bycicle at 3:49

[@dheer369]

look at the moon

[@vincentp5616]

Rip Crash course Physics 😭

[@markholm7050]

You told us we could use angles instead of tangents (small angle approximation), then you went ahead and used tangents anyhow. Why bother with the approximation if you are not going to use it?

[@BlueyMcPhluey]

everything was fine until 6:00 when things got freaky

[@TheHeartOvALion]

A good video but only a slight nod to Antoine Van Leeuwenhoek which is a pity.

[@jesseklaver8905]

Who came for doggo

[@ekbergiw]

My near point was around 12cm, who is included in the calculation of the average?

[@itswarhawk]

Concave+Bats=Batcave

[@hudsonroseboom]

3:49 ET phone home

[@nickyzaman927]

Where is number 40?

[@riverjoefro]

Wow, she's beautiful.

[@discojammingpj5576]

A doge meme, Why

[@fleecemanjenkins6648]

SciFi is officially a normie network

[@JoakimfromAnka]

The doge dog is kinda cute. :3

[@VibeSensational]

Planci Acanthaster not kinda but is

[@kuronosan]

Galileo developed his telescope for the Doge of Venice.

[@firstdictonary]

True, true.

[@aliasgar2646]

isn't this supposed to be #40 instead of#41

[@Robthemaster]

Who understood anything after 6:00 :L

[@mechabunny3323]

My near point (11 years) is 6 cms is that really weird?

[@emmalee4452]

what if I have astigmatism? My eyes are really crap-I can't see anything close or far away.

[@shilpakulkarni1730]

In India hyperopia us call as hypermetropia

[@rajkumarshukla9586]

Mam can we make telescope at ur home to see moons & stars?

[@dhirajborana5943]

I can focus images at 8cm away from the eyes

[@MrE_]

Her uneven sleeves bothered me

[@xaniel6639]

Crash course. using memes for learning. good game crash course DAMN IT WHY CANT I TEACH PEOPLE HOW TO PLAY MINECRAFT WITH MEMES!

[@bruisermachina13]

I am a simple man. I see doge, I wow.

[@poifunlolnofunallowed3353]

i want to see my class find my comment, wheres class 800/801/802?

[@ariztoto]

Hold up. Slow it down coach! - nolifeshaq

[@elechiuche1884]

This was really really fast

[@alexandriteleighmontecarlo5264]

I like you more than my teacher 😉

[@sandrisvirsis6776]

I see red and blue lines