numerical no 12.5 is wrong because as we have studied if the mirror is convex then the focal length must be negative, thus the focal length becomes -13.5cm . If we solve the numerical by negative focal length(-13.5cm) the answer will be 77.62cm which is correct answer on book as well
In numerical number 12.5 the focal length will be negative so it will be -13.5 because it is a case of convex mirror then the answer will be 77.62cm ...
Guys 12.5 ma jis book ma convex mirror likha ha us case ma ham ne image distance bhi negative rakna ha or focal length bhi as you all can check on pg no 41 its written in the box jab ham dono values negative rakhain gy tou hamara answer 77.62 aa jaiy ga try it and your answer will be correct ✅😂❤
numerical no 12.5 is wrong besause as we studied that if the mirror is convex then the focal length will be negitive so the focal length becomes -13.5cm if we solve the numerical by negitive focal length the ans will be 77.62 cm which is 100 percent correct ans
Wrong kiya ha is teacher ne... Part b mai "p" ko tw 2 times krdiya but "q" ka answer bhi two times p k according lana tha , phr two times p aur q ki values add krny se hi ajy gi...
To find the distance from the statue to the mirror, we'll use the mirror formula: 1/f = 1/do + 1/di where: - f = focal length (13.5 cm) - do = object distance (distance from statue to mirror, unknown) - di = image distance (11.5 cm, behind mirror, so negative) Sign Convention: - Convex mirror: f is negative - Image behind mirror: di is negative Given: f = -13.5 cm (convex mirror) di = -11.5 cm (image behind mirror) Plug in values: 1/(-13.5) = 1/do + 1/(-11.5) Simplify: -0.0741 = 1/do - 0.087 1/do = -0.0741 + 0.087 1/do = 0.0129 do = 1/0.0129 do = 77.52 cm Rounded to two decimal places. The distance from the statue to the mirror is approximately 77.52 cm. Please verify calculations!
Numerical number 12.7 is wrong from the last ... Because in the concave mirror the object and focal length is p=50cm and f=19cm respectively.... hence this shows that the object is very far away from focus point... The image will become inverted and diminished...The image can only become upright in the case where f>p so for this image will b Virtual and magnified and upright... According to the ray diagram rules... Kindly recheck the question...
sir the b answer of the numerical number 6 is incorrect according to the book urdu medium now please check this mess out for us please if there is some type of round off problem or something else i will be very thankful to you you really doing a great job for us keep it up as we support you with our best
Numerical 12.5 is wrong because we have studied if the mirror is convex then the focal length must be negative becomes -12.5cm if we solve this numerical by negative focal length -13.5 but the answer will be 77.62 that's a correct answer in book as well
12.6 is also wrong because in the b part he uses old q value but you need to use q value with the p=38.6 the if you use the formula your answer will be hi = 3.84 which is the correct answer also on book
As we know that - Focal length is positive for convex mirror And - Focal length is negative for concave mirror Therefore , Sir did the numerical accurate Some new addition books have wrong answers
Numerical num 6 ka b part wrong Kya hn ap NY sir is ma pahly q find krna hn p ki new value k sath us k bad wo q ki value put krni hn dosry formuly ma height of image find krny k ly
12.6 k b part me image height bhi wrong nikalii hai. q ki new value find kren gy bcoz due to changing the location of object image's distance will also change in that case we'll have to measure the new value of q in accordance to the new value of object's distance
It's not good to solve numericals in front of students. Teachers duty is to teach topics to students and let them to try numericals. it's students duty to solve problems by thinking and in case of difficulty ask teacher. This method is applied in govt colleges only. Coaching centers and private colleges are responsible for stopping creative thinking of students.
Sir g Mena numericals tu Kiya pr Mera convex mirror Ur concave mirror/ convex lens Ur concave lens Mai (p.f.and q ) ka negative Ur positive huna ka concept bilkul b clear Nahi Hu raha app 1 choti se vedio es py bna dan ya mujhy wesy he Bata dan ........................😢
Tum saab logo ik mistake hi nzar ari hay ya nZar naisra ka uno ne kitni mehnat ki hay , INSAN SE HI GALTI HOTI HAY, so agar kio mistake hau tu vooo ap khud correct krlo , by the way your teaching method is amazing 😍🤩🤩🤩🤩🤩🎉🎉🎉🎉❤❤❤❤❤❤ ,sir ☺️😄
numerical no 12.5 is wrong because as we have studied if the mirror is convex then the focal length must be negative, thus the focal length becomes -13.5cm . If we solve the numerical by negative focal length(-13.5cm) the answer will be 77.62cm which is correct answer on book as well
book ma wrong ha
@@Ayesha-id1ud no it not, sir has forgotten that focal length of convex mirror is negative
Focal length negative ni Hoti Image of distance negative hota ha and statement ko thk sa phry ❤
Agar ap ko pata ho ko wo mirror ka case ma hota ha convex lens ma positive hota ha😅😅😅
@@Ayesha-id1udBruhh
For convex mirror focal length is negative so numerical 5 is wrong sir right answer is 77.62
Thikk ha book pr answer wrong ha
@suleman king 826 you r right
Book mein answer correct hai kyun ke focal length is always negative in convex mirror
Yes bro you are right
Sahi
Numerical 7 is wrong
Image will be inverted😕
O yes
Yes
Why will it be inverted
Yes you are right, according to the book's answer the image will be inverted
Right
Numerical 6 is wrong because answer of part B is 3.84 And in numerical 7 image is real and inverted because image is formed between C and F
Same ya hi problem ha
Yes yar
Sorry to say sir your num no. 12.5 is wrong because value of f is negative and so the answer is 77.62 exactly on the book
Yes blkl 😊
In numerical 12.7 the image is inverted not upright
Yeah you are right ❤
Sir you sometimes divide value by 1 and then subtract and sometimes you take L.C.M.Am confused 😕.
Me too🙁
Both methods have right answer
both methods are right
when the lower values are same you can take l.C.M
otherwise you can multiply the values😊
@@zeeshanrajput9138 yes simple conditions har q ke lye diffhoti hen
Sir numerical 12.6 galt hai iss mai jo ap nai last value find kiiii wo 5.42 nhiiii balqai 3.84 hai?? ☹️ 😢😟
Sir apny adaon pay ghor karayen ap ghalat ans day raha hayen hamara khyal kareyn
The Best Physics Teacher I Found On Internet
In numerical number 12.5 the focal length will be negative so it will be -13.5 because it is a case of convex mirror then the answer will be 77.62cm ...
Then why in numerical 12.8 the focal length has taken positive instead the mirror in convex?
@@alibutt4763 because its lense not mirror
Yes you're right, the answer in the book is also 77.62cm
Answer negative ma ha
Guys 12.5 ma jis book ma convex mirror likha ha us case ma ham ne image distance bhi negative rakna ha or focal length bhi as you all can check on pg no 41 its written in the box jab ham dono values negative rakhain gy tou hamara answer 77.62 aa jaiy ga try it and your answer will be correct ✅😂❤
Yes you are right dono values negative karny se answer a gya ha ma ne bhi try kia ha thanku so much ❤
Thanks 😊
No sir na sahi kiya ha
Sir na direct kiya ha LCM ma negative sa positive ma change hogaya ha sign
Main b yehe khny wali the focal length tu negative hu ga convex ki wjy sy
Sir 12.7 me nature of image inverted hogi .
Kon kon agree h is bat pr👍
No
Mana kiya ha sahi ha book ma
numerical no 12.5 is wrong besause as we studied that if the mirror is convex then the focal length will be negitive so the focal length becomes -13.5cm if we solve the numerical by negitive focal length the ans will be 77.62 cm which is 100 percent correct ans
bhai focal length is positive
Nahin bahi negative hoga
😂😮
Sir numerical 2.7 k part(c) mein image upright nhi inverted bn raye😩😰😢😢
I also note this point 😂😂
12.6 b part answer of hi is 3.8cm
Wrong hai
Wrong kiya ha is teacher ne... Part b mai "p" ko tw 2 times krdiya but "q" ka answer bhi two times p k according lana tha , phr two times p aur q ki values add krny se hi ajy gi...
Sir ky sary numerical thikh han 12.5
Ka answer book per wrong ha or 12.7 mein upright hi ha kio ka height of image greater ha height of object sy
Shukr h koi to smjhdar h Wrna idhr to sare ustaad ko Ghlt kh rhy hn..😢
12.6 Numerical b part. When object distance is double. Does image distance change?
Yes...
Yes!!by changing image distance we also change image distance byy the following formula:
1/f=1/p+1/q
We put the new value of p as double..
what is the true method to solve the numerical 12. 6 part (b)
Yae😊
The speed of him in 2x = to the speed of fast academy sir at 0.75x😅😂😂
To find the distance from the statue to the mirror, we'll use the mirror formula:
1/f = 1/do + 1/di
where:
- f = focal length (13.5 cm)
- do = object distance (distance from statue to mirror, unknown)
- di = image distance (11.5 cm, behind mirror, so negative)
Sign Convention:
- Convex mirror: f is negative
- Image behind mirror: di is negative
Given:
f = -13.5 cm (convex mirror)
di = -11.5 cm (image behind mirror)
Plug in values:
1/(-13.5) = 1/do + 1/(-11.5)
Simplify:
-0.0741 = 1/do - 0.087
1/do = -0.0741 + 0.087
1/do = 0.0129
do = 1/0.0129
do = 77.52 cm
Rounded to two decimal places.
The distance from the statue to the mirror is approximately 77.52 cm.
Please verify calculations!
Bhai itna time is pr zaia kia hai 😢
Sir 12.5 ans is wrong
12.6 numerical part(b) is wrong because q of part b also re find and then put values of q then the answer will be correct
Sir you teach us so good 😮
JazakAllah sir 👍
thank sir but it more important if u explain it graphically
Sir you sometimes divide the value and sometimes take the L.C.M and sometimes you multiply the values! How do I know which method I used ?
Dono methods se same answer aega
Both methods have right answer
Exactly I also have same problem 😢
Jab decimal (.)ki form values hongi to aap divide kar lain or agar exact hongi without decimal so normally solve ho jai ga
Answer same nhi ha
Numerical 12.5 is wrong and numerical 12.6 part (b) is wrong 😢😢😢
Yes😮
Sir numerical 5 may focal length bi negative ho gii ku Kay behind convex mirror with focal length ap ko to physics atti hi nae ha
that is wrong
you can't speak foul with the person who teaches you😢
The symbol form of image distance is q not p it is wrong in numerical # 6 which makes a bit confusion
Wa wa nabeela ka makeup b aya hai physics mein
Haha😊😊😊
Sir chapter of 12 numerical ab answers thk hai ya nahi please reply
Numerical no 5 ka answer (77.62) ha👍
Kasa
In convex mirror focal length and image distance .... Negative charge .....your answer of numerical no 5 is wrong
Numerical# 12.5 , 12.6 part (b) , 12.7part (c) ....are wrong!😐
Numerical number 12.7 is wrong from the last ... Because in the concave mirror the object and focal length is p=50cm and f=19cm respectively.... hence this shows that the object is very far away from focus point... The image will become inverted and diminished...The image can only become upright in the case where f>p so for this image will b Virtual and magnified and upright... According to the ray diagram rules... Kindly recheck the question...
Please correct the numerical 12.5 otherwise some students will do this wrong question
The answer of last part of 12.6 is also wrong and the image in 12.7 in inverted not upright. . . please focus on these mistakes
In numerical 12.6 part b is wrong
The answer of part b on book is 3.84 but your anser is 5.42
So plz tellme the right ans
Sir ap kabhi kisi question ma LCM lata gain kisi main - karta hain please itna Bata dain konsa method kaha lagana ha please please please
As I am Alhamduliallah a very complicated student 😂😂 so I did it minus and LCM as well 😅 and I got same answers to bro jahan mrzi jonsa mrzi lgao 😊❤
Khudara yaar abb aisy sawal krna hi reh gaya tha.. 😂Thora tou apna dimagh or marzi bhi lagao naa😅
Answer same aya ga
sir the b answer of the numerical number 6 is incorrect according to the book urdu medium now please check this mess out for us please if there is some type of round off problem or something else i will be very thankful to you you really doing a great job for us keep it up as we support you with our best
12.6 b part is wrong. we will put p[multiplied by 2] again in mirror formula and then find the image of height
Numerical 12.5 is wrong because we have studied if the mirror is convex then the focal length must be negative becomes -12.5cm if we solve this numerical by negative focal length -13.5 but the answer will be 77.62 that's a correct answer in book as well
Yar wesa book wala Aur numericals samjana wala hama pagal bana raha ha😂😂😂
The answer of numerical no 12.5 is not wrong but wrong in our books so sir,s calculation is correct 💯
Yes
It's 12.6 not 12.5
Because when the distance of the object becomes double then the distance of the image also double
So the value of q also changes we have to find it again with the help focal lengtg
Thank you sir ❤❤ you are great ❤❤
🤮🤮🤮🤮🤮🤮🤮
12.6 is also wrong because in the b part he uses old q value but you need to use q value with the p=38.6 the if you use the formula your answer will be hi = 3.84 which is the correct answer also on book
Book par 5th numerical ka answer ghalat hai
Nahi
Sir rehan your numerical answers is wrong
Plzzzzz check your answer
And Right clearfully
This teaching is helf me❤❤❤❤
12.6 part b wrong 😢
kiss k 490 se upr he number 9th me cmnt like kre
Sir! 'c' part of 7th numerical is wrong. It's actual answer is inverted and you said upright which is altogether wrong 😢
As we know that
- Focal length is positive for convex mirror
And
- Focal length is negative for concave mirror
Therefore , Sir did the numerical accurate
Some new addition books have wrong answers
Thank you sir 🙂😊😊
Answers of many numericals are wrong for example numerical no 2 me (_) nahi ha, 😔. I'm very confused!
Numerical 6 is b part is wrong
Numerical no 12.5 wrong hai
Sir 12.5 numerical answer is wrong in that answer is 77.62cm but your answer is 6.21
Numerical num 6 ka b part wrong Kya hn ap NY sir is ma pahly q find krna hn p ki new value k sath us k bad wo q ki value put krni hn dosry formuly ma height of image find krny k ly
12.5 is absolutely correct and those who are spreading hate should check it twice
It's absolutely wrong
See carefully
12.6 part b is also wrong as you have to find the value of q again to solve it
12.6 k b part me image height bhi wrong nikalii hai. q ki new value find kren gy bcoz due to changing the location of object image's distance will also change in that case we'll have to measure the new value of q in accordance to the new value of object's distance
Thanks
It's not good to solve numericals in front of students. Teachers duty is to teach topics to students and let them to try numericals. it's students duty to solve problems by thinking and in case of difficulty ask teacher. This method is applied in govt colleges only. Coaching centers and private colleges are responsible for stopping creative thinking of students.
example 12.1 main foca length neagtive li gae hy jb convex mirror hu ga....
usi example k upr aik table bna hua sign sy related .... chek it plz
12.5 numerical wrong because convex mirror ki focal length is negative agar negative f k sath solvr kary to correct ans P=77.62 cm ata hai
12.7 image is inverted
Book ma wrong ha
Sir please yai corform kar dy ky konsa answer correct hai, ya book pr mistake hai
U have done wrong numerical 5
numerical 12.6 part b is wrong
Sir numerical 2.7 ma image upright nai inverted h. plzZzzzzzz mistake mat kia kran confused kar data hn😂😂😊
Oye book py galti Hai anwwi mon utha kar sir mistake na Kiya karain hun ......
😂😂😂😂
Wrong numerical 12.5 or 12.6
Numerical no•
6 part 2 ka jawab nahi Sahi
Thanks
12.6 b part is also wrong
Thanks sir 😊
Numerical 12.6 third answer wrong. Answer 3.84 Ana ha .you answer 5.42. So sad
5 numrical is wrong
sir jab value invert hoti hai to power change hota hai............................🤔🤔
Thanks 👍👍👍👍👍👍
sir sorry to say but i dont like your teaching methodology
i dont know why they are just misguiding the students
Sir 12.5 is wrong convex mirror me focal length negative hty ha or apki waja se mera board me ye numerical ghalt hugya haa i am really disappointed 😞
Noo convex mirror mn focal length + hotey ha
@@nasimsana9766 pg 41 dekho
ohho kitna ai marks??
12.6 ka b part ne solve kiya ap ny????
Yes 12.5 is wrong sir agr ap ghalat question batain gy to hum students ka kiya Hoga plz be careful 😊😢
Numerical 12.5 is wrong😊
Sorry, but numerical 12.5 is not correct. Thanks!!!!!!
In 12.7 numerical the image will not be upright, it will be inverted, it's wrong
Sir but answer is wrong
Apne 12.6 me jab obj distance double Kia he to answer 3.84 ae ga ap Ka answer Galt he
Kesy btao
Sorry Sir the answer is 3.84 cm but why
No numerical 12.5 is wrong this numerical used in convex mirror his focal length is negative
Sir 12.5 numerical answer not correct
i alway come to u for numerical u explain it very well ..
Sir g Mena numericals tu Kiya pr Mera convex mirror Ur concave mirror/ convex lens Ur concave lens Mai (p.f.and q ) ka negative Ur positive huna ka concept bilkul b clear Nahi Hu raha app 1 choti se vedio es py bna dan ya mujhy wesy he Bata dan ........................😢
6 numerical main b wale ka answer galat ha write answer is 3.84 but ap ka 5.42 aya ha
The image is inverted in numerical 12.7❤
Tum saab logo ik mistake hi nzar ari hay ya nZar naisra ka uno ne kitni mehnat ki hay , INSAN SE HI GALTI HOTI HAY, so agar kio mistake hau tu vooo ap khud correct krlo , by the way your teaching method is amazing 😍🤩🤩🤩🤩🤩🎉🎉🎉🎉❤❤❤❤❤❤ ,sir ☺️😄
Hm😊❤
Sir your answer for 12.6 is also wrong