for everyone confused let me help u a bit see c/n1/sin i = c/n2/sin r this is what it says, now after it what we do is ------ c/n1* sin i = c/n2* sin r ----- this is because we are dividing c/n1 by sin i so it means c/n1 * 1/sin i ( basic reciprocal ) so now we cancel both Cs and we get --- 1/n1 sin i = 1/n2 sin r. now just reciprocal and we get n1 sin i = n2 sin r. if u didn't understand....then reciprocal c/n1/sin i = c/n2/sin r ------------------> sin i/c/n1 = sin r/c/n2 --------------> sin i * n1/c = sin r * n2/c now cancel the Cs and we are left with *Sin i n1 = Sin r n2*
Ya! Thank you so much for clearing this doubt. On doubt is also there please solve it. In sign convention of concave mirror and convex mirror mam take concave mirror towards the -x axis but we can take it towards +x axis so then u should be positive but mam said that u is always negative. An din numerical mam take u as negative only. Confused😵😕😕😵😕😵😕
@@divyayadav6748 we cannot take concave mirror on +x axis according to new Cartesian sign convention as object is taken on left side of mirror.... Hope you got it
When c will be cut then 1/n1× 1/sin1 = 1/n2 = 1/sin2 So n2/n1=sin1/sin2 Therefore sin1 n1 = sin2 n2 So formula is correct but mam did mistake in cutting and all
Mam actually I have a doubt here u have written sin i / n1 = sin r / n2 and in next step u have written sin i / sin r = n2 / n1 Mam but I think that it must be sin I/ sin r = n1 / n2 as we know that when we change side in equality so multiply becomes divide and divide becomes multiply…. So according to this I think that it is wrong and the formula formed at end is also wrong…… time in lecture 20:40 pls reply Mam….🙏🙏🙏🙏🙏🙏
For everyone wondering mistake in in 2nd law on snell's law of refraction - When c will be cut then 1/n1× 1/sin1 = 1/n2 = 1/sin2 So n2/n1=sin1/sin2 Therefore sin1 n1 = sin2 n2 So formula is correct but mam did mistake in cutting and all
Ma'am u made a error in deriving the formula, after cutting both the C in LHS and RHS, the answer will be 1/n1*sin i = 1/n2*sin r and then we will get the final form. Please check
Ma'am you told us wrong that v1/sin i= v2/sin r because it doesn't satisfy sin i/ sin r = n2/n1 It should be =>sin i/sin r = v1/v2 =>sin i/sin r = (c/n1) / (c/n2) =>sin i/sin r = n2/n1 Hence my formula satisfied.
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Mam 20.25 min se calculation wrong hai mey eske wajah se bahut confused ho gayi thi . Last formula sahi hai par bich ka process wrong hai . Koi mujhe batao . Am l right .
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Mam,if i am not wrong then you did mistake V1/sin-i=V2/sin-r c/n1÷sin-i=c/n2÷sin-r Sin-i/n1=sin-r/n2 Here all the things going correct but Then you wrote Sin-i/sin-r=n2/n1 Which is i think wrong🤔
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You're welcome! We are glad to be able to provide educational videos that can help you learn more. If you have any questions, please don't hesitate to reach out. Happy learning!
Thank you for your comment! The formula you mentioned is used to calculate the velocity of an object in a medium with different refractive index. The refractive index is the ratio of the speed of light in a vacuum to the speed of light in a medium.
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"At 20 minutes and 30 seconds, n1 is replaced by n2, and at 20 minutes and 33 seconds, n2 is replaced by n1."
Magnet brains is best
for everyone confused let me help u a bit
see c/n1/sin i = c/n2/sin r
this is what it says, now after it what we do is ------ c/n1* sin i = c/n2* sin r ----- this is because we are dividing c/n1 by sin i so it means c/n1 * 1/sin i ( basic reciprocal ) so now we cancel both Cs and we get --- 1/n1 sin i = 1/n2 sin r. now just reciprocal and we get n1 sin i = n2 sin r.
if u didn't understand....then reciprocal
c/n1/sin i = c/n2/sin r ------------------> sin i/c/n1 = sin r/c/n2 --------------> sin i * n1/c = sin r * n2/c
now cancel the Cs and we are left with *Sin i n1 = Sin r n2*
Thank you brother........... I was totally confused 😵😵 in this formula. But now I got this ☺☺☺
Wah re berozgaar. Waah🙏🙏🙏🙏🙏🙏🙏
Correct ........ Mam shouldn’t cancel “c” at the first step.
Isn’t it?
Ya! Thank you so much for clearing this doubt. On doubt is also there please solve it.
In sign convention of concave mirror and convex mirror mam take concave mirror towards the -x axis but we can take it towards +x axis so then u should be positive but mam said that u is always negative. An din numerical mam take u as negative only. Confused😵😕😕😵😕😵😕
@@divyayadav6748 we cannot take concave mirror on +x axis according to new Cartesian sign convention as object is taken on left side of mirror....
Hope you got it
20:51 On Cross Multiplication, How You Got Sini/Sinr = n2/n1. But You Cross Multiplication Doesn't State That You Cross Multiplication Is Wrong There.
When c will be cut then
1/n1× 1/sin1 = 1/n2 = 1/sin2
So n2/n1=sin1/sin2
Therefore sin1 n1 = sin2 n2
So formula is correct but mam did mistake in cutting and all
20:50 here you have written wrong ratio , here sin I/sin r= v1/v2
Hahah
No r u mad it is sin i/sin r
uh actually it is v2/v1 maam hasent explained it properly
V1/SinI=V2/SinR is equal to Sinl/SinR =V1/V2.
Both Formulas are right
I think there is no point of v out here as we write c/n in place of V
And mam did wrong was that sini/sinr=n1/n2 (not n2/n1)
Mam actually I have a doubt here u have written sin i / n1 = sin r / n2 and in next step u have written sin i / sin r = n2 / n1 Mam but I think that it must be sin I/ sin r = n1 / n2 as we know that when we change side in equality so multiply becomes divide and divide becomes multiply…. So according to this I think that it is wrong and the formula formed at end is also wrong…… time in lecture 20:40 pls reply Mam….🙏🙏🙏🙏🙏🙏
Mistake at 20:22 because sin.i and sin.r will not go at the place of numerator they will go to denominators :-
1/(n1)(sin.i) = 1/(n2)(sin.r) ✔
There was a mistake by mam at 20:45
Sin i /Sin r = n1/ n2
She wrote:-
Sin i / Sin r = n2/ n1
Koi baat nhi galti insaan se hi hoti hai.
This ratio uses by mam in further video so this create confusion
Mam solve it please
Correct hai
To phir bola kyu
@@queenofindia8158 😂😂👍
Krishna u are right because I am also seeing
For everyone wondering mistake in in 2nd law on snell's law of refraction -
When c will be cut then
1/n1× 1/sin1 = 1/n2 = 1/sin2
So n2/n1=sin1/sin2
Therefore sin1 n1 = sin2 n2
So formula is correct but mam did mistake in cutting and all
Thank you for your comment! We're glad you're enjoying our videos and we appreciate your feedback. We'll try to be more careful in the future.
I start physics , I didn't start trigonometry now thats why i feel it trouble in Snell law but when syllabus will start i understand it
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Thodi oye
@@rahulatri0 same reaction
@@Gautam_022
Lol
Mere sath b aisa hua par isme sirf trigonometry sine, bagera values h ap trigonometry table samaj lo google pe image dekha lo
Mam sini /n1= sinr/ n2 = sini/sinr = n1/ n2 hoga which is wrong
Yeahh
Ma'am u made a error in deriving the formula, after cutting both the C in LHS and RHS, the answer will be 1/n1*sin i = 1/n2*sin r and then we will get the final form. Please check
Yes i noticed that too
There is a question, how many formulae for refractive index are there?
Maybe 3
Your are the best teacher madam.
Thank u soo much ma'am ❤
Kal mera exam hai thanku so much once again ❤😊
Ma'am you told us wrong
that v1/sin i= v2/sin r because it doesn't satisfy
sin i/ sin r = n2/n1
It should be =>sin i/sin r = v1/v2
=>sin i/sin r = (c/n1) / (c/n2)
=>sin i/sin r = n2/n1
Hence my formula satisfied.
What she took was correct, but after cancelling c, it will be
1/n1 sini= 1/ n2 sinr
=> n2 sinr = n1 sini
ie n1sini =n2 sinr
Mam How ?
Sin i/n1 =Sin r/n2
Changes to -
=> Sin i/Sin r = n2/ n1
(IT IS WRONG)🤔🤔
Yes I have doubt too,,,,
Yes its wrong
Explanation bhout bharya hai mam .....thanks to whole magnet Brain team
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Happy teacher's day ma'am
Thanks beta
Hello
@@harshprajapati8228 sale ladki dekhi nahi line marna shuru
Helo murshida
Mai tumahra channel subscribe kardiya hu
I'm from Pakistan Mam And your lectures are Awesome 😊
Thankyou Mam. After watching your lecture, I have understood all the doubts.
Sini/n1=sinr/n2 or sini/sinr=n1/n2. This should be mam
Watch full vid, mam has derived that thing 🤦
Mam has done only some minor mistake of dividing sin I by n2 and sinr and by n2 but at last the equation is right
@@baibhavgandhi9200 But bro Mam derived wrong equation.
For finding the angle of incidence or angle of refraction Snell's use this equation ; sin i / v1 = sin / v2
Or if refractive index is given then Sin i / Sin r = n2 / n1
Very nice explanation ,very easy to understand
❤❤💯💯
Your explanation is nice in magnet brain
it is very helpful video for mental
Mam there is something wrong I think 20:50. Sini/Sinr = N1/N2
Is she wrong?
Yes
@@omsanti4195 - yes
Tum aapne se equation solver kar lo answer utna hi aaye gaa
Tumhara answer incorrect hai
Mam 21:32 pa jab cross multiply kiya to n2sini=n1sinr. But aap kuch aur likha hai 🤔
Best teacher of physics on RUclips
Kaise?
Ma'am plz make one shot revision of refraction of light chapter
"Aa gyi hamko bat samjh me"😄 Thankyou so much ma'am...
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Mam 20.25 min se calculation wrong hai mey eske wajah se bahut confused ho gayi thi . Last formula sahi hai par bich ka process wrong hai . Koi mujhe batao . Am l right .
Yes
Yes
Same with me
Ohh no
Same with me
Mam it is sini n2=sinrn2.. Plz check once
smriti agrawal, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
Thank you mam aap ne bahut help ki h
20:53 Mam how can it be sin i/sinr=n2 /n1???
Ankan, Thanks for being active on the channel. Do recommend us to your friends.
Yes mam🤔
Same Q arise in my mind??
Thank you ma'am 🙏
*Amazing explanation mam... 😇😇*
The relation according to cross multiplication is wrong it should be n2 sin i=n1 sin r
Sin i/sin r=n2/n1..how ma'am many of the students are having this doubt please solve it at the earliest!
This vedio is very helpful to me for understanding snell law thank you mam
i request mb to please ad teacher"s name with their videos so that it would be easy to find their sessions
Ma'am I didn't get the following thing
Sin i/ n1 is equal to Sin r/ n2
Nice mam
Kuch term 1ke liye banaya
Jises kuch help mila
Rakesh Kumar, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
Thank you ma'am, it helps me a lot
6 : 50 God bless u Ma'am💐
Hii
Ma'am your classes are awsome ❤
Mam Kya sin i÷sin r constant isliye ho jayega kyunki angle of refraction angle of reflection ho jayega jab dono medium same ho?
Yess
Constant ka kya matlab hai yaha pe ????
Anyone answer...
Constant means same
That can't be changed
Mam absolute reflective index kai numerical smjhiye
Ma'am Snell ne kaha tha Sini/v1=Sinr/v2.
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@@MagnetBrainsEducation yes ma'am I realy like the teaching style and details.
Thanks a lot maam ...ur teaching style is always *awesome*✨✨👌👌
3 laws kaha hai refraction ka 2 hi hain n... Please reply anybody....
Nature and position of the images formed by a concave plzz iske super video banye
Thank you so much ma'am 🙏🙏🙏🙏 Great efforts are being done by you.
Kon kon manta h ki magnet brain is best 👌🏻👌🏻
Main to nahi manti
mam you write following are the three laws of refraction but you delivered the only two laws.
Maam pls make a specific video for snells law
Aapne jo velocity vla fomula padhaya usme sin i kya likhna h
This video was really helpful.. thnku so much..
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Mam,if i am not wrong then you did mistake
V1/sin-i=V2/sin-r
c/n1÷sin-i=c/n2÷sin-r
Sin-i/n1=sin-r/n2
Here all the things going correct but Then you wrote
Sin-i/sin-r=n2/n1
Which is i think wrong🤔
Thanks mam and hole megnet brains .who give us free education and help uh in all feild and also thanks for your hard-working ...🖤❣️
Thanks a lot for your kind words! We are delighted to be able to provide free educational videos to school students. We are glad to know that our videos are helping you in various fields. We appreciate your support and wish you all the best for your studies!
Thanks for explaining in better way
Thanks
Mam agar ham medium same rakhenge tab to hamara refraction hoga hii nhi aur tab phir kaise ratio banega🤔🤔🤔
Agr pair of media same rakhay gay
The dutch scientist, Snell iscovered that it was the sine of the angles which were in proportion and not the angles themselves. that why he used sine.
👍👍
Thank u for giving me such a beautiful greatful video 😊😊🙏
SHRUTI KUMARI, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
@@MagnetBrainsEducation thankyou
Mam thanku 💫
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You all teachers are best
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Thanku mam
You're welcome! We are glad to be able to provide educational videos that can help you learn more. If you have any questions, please don't hesitate to reach out. Happy learning!
Nice mam
Mam please give the example of this formula Vi/ sin¡ and Vr/sinr
Thank you for your comment! The formula you mentioned is used to calculate the velocity of an object in a medium with different refractive index. The refractive index is the ratio of the speed of light in a vacuum to the speed of light in a medium.
First time I understood this concept. Thank mam for free education during the time of vivid crisis.
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Thank you ma'am for free learning I cannot I cannot understand maths but you when you teach me I learned it 😄😄😄😄😄😄😄😄😄😄
Wrong derivation of n1 sini=n2sinr
After cancelling c (speed of light in vacuum) it should be 1/n1/sini =1/n2/sinr
Pure youtube par aapka hi channel pe samajh aaya
Mam last me calculation galat hai 22 mins par
Thank you for catching that! We updated the video and the new answer is 24 minutes.
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❤❤❤❤❤❤❤❤
❤❤❤❤
❤❤❤❤
❤❤❤❤❤❤
Thankyou for your this video
IT is very helpful for me
This video is solved my problem with formulas and numericals 🤷🤷🤷🤷
Thank you so much for watching our videos! We're glad that you found them helpful and we hope that you continue to learn and grow from them. :)
Thank you 🙂 ma'am
?
Mam thank you so much your channel is very helpful for me
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Previous Video:
Daily Practice Questions (Part-5) - Light: Reflection And Refraction
ruclips.net/video/5nycarafY_E/видео.html
Next Video: The Direction of Bending of Light - Light: Reflection And Refraction
ruclips.net/video/-nh3zj0mwys/видео.html
Mam may all india hartal karana chata hu will you support
Mam may all india hartal karana chata hu will you support
Mam may all india hartal karana chata hu will you support
Mam may all india hartal karana chata hu will you support
Mam may all india hartal karana chata hu will you support
Mam,you have given a wrong report on 2nd form of Snell's law 🤔🤔🤔 why????
Nice explanation 👍😍
Anushka Patel, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
Amazing👍👍👍👍👍 😇😇tnx mam
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THANK you so much mam THANK you a lot
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@@MagnetBrainsEducation yes mam
Amazing 👌👌👌 what an explanation 👌👌🤟🤟
Best explanation of this difficult topic
Mam ek bar aur laws of refraction pada dejiye please mam
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VERY GREAT MAM VERY S
Thnks a lot mam ❤❤ ur the best ❣️😘
Thank you so much for your kind words, we're happy to hear that you're enjoying our videos!
Mam ..
How is it right. sini/sinr= n2 /n1
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@@MagnetBrainsEducation answer of my question?? 🤔
Aap ka fan ho gya mein .thanks sister
Mam notes kaha se milege
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There is a link of notes in description box
I didn't start trigonometry now so I am getting trouble with the 2nd law of refraction
Same with me and my exams are also starting from 2nd July...
Same
Thank you ma'am it was a great and helpful video.....I understood each and everything🙏🙏
Best teacher of physics ❤🎉
Last m glt bataya mam cross multiplication ek baar check kriye bhut confusion ho rhaa😮
Ma'am how sin i n1= sin r n2
plzzzzzzzzzzzzzzzzzzzzzzz answer
Derivation h ye
Bhai glt multiply hua h
You are great mam ❣️❣️🥰🥰
Mam i think n1sinr=n2sini hoga
good teach mam thank you 🙏🙏🙏
Thanks maam this helped me a lot
Thnquh mam it really helps me alot
Mam aj SSC KA s1 exam hua maine laws me yehi likha hai ....kya oo 3 rule likne the kya oo light ray kis trh bend hota hai oo to nahi
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@@MagnetBrainsEducation mam mere Q ka ans do plz