Revision: Human eye & colourful world | CBSE board exam | Khan Academy

Let's summarise entire chapter of Human eye & colourful world

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Created by Mahesh Shenoy

[samriddhigoel]

Some channels are extraordinaly fantastic. Like seriously, my relatives stressed a lot on watching Khan Academy videos but I didn't and I can now realise the loss I faced all these years. Now I feel that my school tutors know nothing and don't know how to teach at all. You people have an answer to every 'WHY' that came up in my mind and know exactly what we must have thought at that moment.
HATS OFF TO YOU SIR AND YOUR TEAM!!
I love you guys infinite!!

[t.vinitreddy]

Some things deserve more than they have.And this channel including Khan Academy deserves more subs and supports.
Keep it up sir 👍

[prakashmenezes]

the books didn't make a mistake in the dispersion, as you can see, there is space between two prisms and hence the light switches from denser to rarer and back to denser hence resulting in white light at the very end.. and hypothetically, we always consider one ray of light while doing ray diagram as multiple rays will also result in parallel dispersion, giving a larger sort of rainbow; that is, unless you consider a large amount of light incident on first prism.. it will just make it more confusing. So basically, just recheck if the books are correct, maybe? AND also if all colours overlap at the end, the resulting ray formed will be larger compared to the initial white light, like sort of torch which is not possible

[sureshmk]

More people need to watch these kind of video to understand our own body parts and how it works.

[Rotaks]

Are you sure with this accomodation and that the muscles work in that way as you described? I heard something opposite.
For far object you need to STRETCH the lens, and to do that you need to tight the muscles.
For close object the lens needs to relax (contract) so the muscles need to relax.

In my version - muscles pull (or not) the lens - to change it shape. So they work like... triceps.
In your version - muiscles squeez (or not) the lens - to change it shape. So they work like biceps.

Are you sure about your version?

[pavansrinivas]

Thanks for these videos...
That's really interesting and Easy to understated

[annesarah..]

This Channel requires more and more support

[nsowdkar]

mahesh sir do all colours of white light move at the same speed in air ncert examplar)

[kiranbhat]

Mahesh sir In ncert text book there is gap between 2 prisms but not in ur diagram does it lead to recombining as given in text book

[kiranbhat]

Mahesh sir what is difference between internal reflection and total internal reflection????Why doesn't total internal reflection take place in rainbow????

[AdithyaNayak-yz]

Can any teacher be as googd as this sir

[nishitashankar]

Thank you so much! I understood the concept clearly

[khyati]

Nice explanation but if NCERT itself is wrong then how would they expect us to be always correct

[manimalasuresh]

How myopic persons can see the stars at night?

[awwrat]

yes, we can belive in you but we have write what ncert says

[soccertricks]

khan academy website suddenly stopped working today and it is showing site cant be reached i dont know what to do i have tried to open it from another browser but it was too failed and again i tried open it from another device itself but no luck please khan academy help me

[taranathb]

Thank you sir . It helped me a lot to revise quickly

[jawaharsingh]

25 cm is not the near point but the distance for best vision for human eye 😎🤔