How To Use LENS MAKER FORMULA : Sign Convention and LENS NUMERICALS: Class X :ICSE /CBSE PHYSICS

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  • Опубліковано 9 лис 2024

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  • @PhysicsWallah
    @PhysicsWallah  6 років тому +470

    Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, dynamic Exercise and much more on Physicswallah App.
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    What will you get in the Lakshya Batch?
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    2)Live Classes and recorded Video Lectures (New, different from those on UA-cam)
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    4)DPP: Daily Practice Problems with each class having 10 questions based on the class of JEE Mains/NEET level.
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    • @ratankumarmahato8192
      @ratankumarmahato8192 5 років тому +1

      Ye lens formula hai, Lens maker's formula me Refractive index of glass & focal length ke bich relation hai

    • @saritadev6604
      @saritadev6604 5 років тому +15

      @@mohitdahiya1224 tmig nhi h kya tumha bolna ki...........
      Ki kasa kisi teacher sa bola gata h,, jo ki tumha free ma pdha rha h

    • @skeshri1389
      @skeshri1389 5 років тому +8

      @@saritadev6604 u r right......seriously they just don't hv any manners........shameful

    • @partimashahi1153
      @partimashahi1153 5 років тому +4

      Yes you are right sarita whatever you said

    • @saritadev6604
      @saritadev6604 5 років тому +1

      @@partimashahi1153 thanks

  • @jypn30
    @jypn30 6 років тому +141

    Rare to find teacher like you, who makes physics so simple to understand

  • @aanchalnagar21
    @aanchalnagar21 Рік тому +294

    20223-24 batch 🙋

  • @akshatdubey6962
    @akshatdubey6962 4 роки тому +706

    English aur hindi ke transition me sir ka tone kitna badal jaata hai!😂

    • @uniqueid2414
      @uniqueid2414 3 роки тому +4

      Sahi pakde hein

    • @uniqueid2414
      @uniqueid2414 3 роки тому

      😂

    • @uniqueid2414
      @uniqueid2414 3 роки тому +18

      Sir ne ek bar kaha tha ki mene English Oxford se li hai😂.
      But I love sir for the teaching so well🙏.

    • @jayhind421
      @jayhind421 3 роки тому

      @@uniqueid2414 ff

    • @Idk_4742
      @Idk_4742 3 роки тому +12

      Yeah, he speaks normal in hindi but lil bit louder in English.😂

  • @dakshamahuja4663
    @dakshamahuja4663 5 років тому +320

    Please dont disrespect your teacher.....he is teaching for us... He could have taught cbse ...but he chose icse only bcoz of us........atleast he is teaching....and that totally free of cosst.......may u live long sir.....do ur best and LET THE DOGS BARK BCOZ HATERZ GONNA HATE...

    • @GAURAvSharma-zn4ey
      @GAURAvSharma-zn4ey 3 роки тому +3

      😯

    • @arya_4883
      @arya_4883 3 роки тому +62

      Comments me to kahin dikh nai rha ki sir ko koi disrespect Kiya hai

    • @shivamvaze8509
      @shivamvaze8509 2 роки тому +19

      @@arya_4883 main bhi vohi dhoondh rha tha

    • @audipuff8637
      @audipuff8637 2 роки тому +8

      I really respect alakh sir even I have taken the membership. But sorry I can't stop my laugh watching the 5 years ago alakh sir

    • @audipuff8637
      @audipuff8637 2 роки тому +8

      6:26 the question reads 😂😂😂😂

  • @chandranimukherjee5312
    @chandranimukherjee5312 5 років тому +74

    This is white magic
    How can you teach so good???😃😃😃
    I can certainly tell you practise teacher sorcery.

  • @ashpal123
    @ashpal123 7 років тому +684

    When I saw your videos, and came to your channel to subscribe, first thing i checked was whether or not you are consistent in putting up videos till date or not? Have seen many experts start a channel and leave it midway. Please keep posting. You are more than awesome and a hope for physics learners. God bless you with the energy to pursue this passion.

    • @PhysicsWallah
      @PhysicsWallah  7 років тому +523

      thanx ashish , yes i will cover full syllabus , uploading of videos is a tiring process thats why it is taking time , else i can teach whole topics in one day only

    • @pinkighosh9492
      @pinkighosh9492 7 років тому +43

      ohh! sir... but i don't think so that anything will go inside the students head in one day covering all the topics..!! but one thing to say.... is that your explanation is awesome...,!!

    • @kamleshshukla7437
      @kamleshshukla7437 6 років тому +5

      Ashish Pa

    • @gurumobileguruji1608
      @gurumobileguruji1608 6 років тому +6

      agree #ashish pal

    • @labakumardebnath9682
      @labakumardebnath9682 5 років тому +4

      @Ashis Pal Where from you?

  • @rashmisarda4597
    @rashmisarda4597 5 років тому +95

    A day before physics board exam ..... I don't know lens maker formula at all..... I said to myself " darna kyon hai physicswallah hai na """ thank you sir ....greatly indebted to you

  • @PrakashSingh-xh7xg
    @PrakashSingh-xh7xg 7 років тому +471

    best explained ever...!

    • @RaushanKumar-xj2cg
      @RaushanKumar-xj2cg 4 роки тому +5

      Kaise best explanation hua bhai numerical galat hai

    • @PrakashSingh-xh7xg
      @PrakashSingh-xh7xg 4 роки тому +23

      @@RaushanKumar-xj2cg Bhai agar tu sirf ek numerical dekh Kar judge karta hai......to tu tujhse bada immature insaan koi nhi hoga....!!

    • @RaushanKumar-xj2cg
      @RaushanKumar-xj2cg 4 роки тому +2

      Kaise immature insan hai

    • @RaushanKumar-xj2cg
      @RaushanKumar-xj2cg 4 роки тому +3

      Dekhange too Pura n?

    • @RaushanKumar-xj2cg
      @RaushanKumar-xj2cg 4 роки тому +3

      Ha mante hai ke explanation best hai too usko kharab kar denge sab kuchh best rahna chahiye n?

  • @Dasssshh
    @Dasssshh 3 роки тому +37

    U are just like my friend who teaches everything before 15 mins of my exam

  • @Aryapandey07
    @Aryapandey07 4 місяці тому +308

    2024-2025 batch 🙋‍♀️

  • @amartyaaaacademy1093
    @amartyaaaacademy1093 4 роки тому +67

    A god in teacher's face

  • @samadritodey
    @samadritodey 4 роки тому +17

    One of the best teacher who has the urge in him to make students better.
    He could have easily taught in vedantu or unacademy like online institutes but he chose to put up his own channel....
    Hope the channel grows day by day...
    Loads of love and wishes...
    ~SAMADRITO
    Student of Adamas International School,Kolkata.

  • @dilpreetk7942
    @dilpreetk7942 4 роки тому +6

    You have became my only hope when I just determined that I will study science in most interesting and efficient way instead of learning and memorizing topics as I always used to do.

  • @earner.s_empire
    @earner.s_empire Рік тому +15

    I know if you are watching 👀 this video now then I can tell that tomorrow is your physics exam, because that's what I am doing now watching his video now before my exam 😁😁
    So, chalo dekhte hai feer ha ki kal ka paper kesa jata hai

  • @chetangupta1754
    @chetangupta1754 4 роки тому +184

    2:28 sir ne Hindi bol hi di🤣🤣🤣🤣

    • @theabhiram1639
      @theabhiram1639 4 роки тому +5

      Yea I am watching that rn

    • @akashkumarmishra4446
      @akashkumarmishra4446 3 роки тому +10

      Sir be like: chal tere aise ki tesi ab apun hindi bolega ......😂

    • @asthasingh8707
      @asthasingh8707 3 роки тому +2

      sir ne per bola kab ki vo eng hii bolenge................comeon kuch bhi bato pe majk met udhaya keroo

    • @rishavdas687
      @rishavdas687 3 роки тому +1

      🤣🤣

    • @mohaksethi6381
      @mohaksethi6381 3 роки тому +1

      😂😂😂😂😂😂😂😂😂😂😂

  • @anupbhakta7347
    @anupbhakta7347 5 років тому +20

    Don't stop making ur spectacular videos...I always get massive help from your videos..that way you teach......clears the doubts inside my mind!!!!! .......You generally teach all ICSE chapters in Physics and I would like it if you complete the syllabus really fast but there's no hurry!!!! I never loved reading or learning from a phone but now you seemed to change the aspects even.....I am obliged to call you a sir!

  • @enamsonavil6269
    @enamsonavil6269 4 роки тому +117

    2:28😂😂😂😂love you sir from North east

  • @orangecounty4143
    @orangecounty4143 3 роки тому +8

    U covered 1 exercise in 10 mins truly appreciate your help.

  • @goblin44490
    @goblin44490 4 роки тому +17

    No body in this whole universe can teach like Physics wallah sir.🙏🙏
    Your amazing explanation is the universal truth of physics, made easy.

  • @devan.shee08
    @devan.shee08 Рік тому +20

    From Physics Wala to Physics Wallah, sir we are with you And will always be thankful to you for your full-hearted effort 😊😊

  • @physicon29
    @physicon29 5 років тому +7

    Us time me aur aaj me aap bht change ho chuke hai🔥🔥

  • @TRLIVESTREAM
    @TRLIVESTREAM 3 роки тому +12

    8:23
    Isko mind me karne k liye 1 trick hai
    F1=10cm diya hai iska matlab 2F1=20cm hoga aur object bhi 20cm diya hai matlab object is at 2F1 so image will be formed at 2F2 jus opposite and at same distance....
    Ty to ALAKH SIR for te best explaination

    • @a10warthog54
      @a10warthog54 2 роки тому +1

      Thx yaar will save a lot of time in mcqs

  • @BabitaPatel-i5k
    @BabitaPatel-i5k 3 місяці тому +7

    I wish😊😊😊 everybody gain 90%

  • @vanshikapal8754
    @vanshikapal8754 2 роки тому +823

    Tomorrow is my phy boards exam...any one like me???😂🥺💔

  • @memeswala5425
    @memeswala5425 Рік тому +33

    Batch 2023-24 attendence lagao ❤

  • @hemant3357
    @hemant3357 6 років тому +225

    2:28 sir ki hindi bhi nikal hi hyi😂😂😂😂😂😂😂

  • @hitanshugala9191
    @hitanshugala9191 4 роки тому +41

    Thank you sir !! finally understood how we get object distance in negative !! 🙏🙏

  • @sweksha5479
    @sweksha5479 3 роки тому +23

    A blessing for students like me ❤️

    • @peaceinmoto4022
      @peaceinmoto4022 3 роки тому +5

      Hlo

    • @07.sparkz
      @07.sparkz 3 роки тому +7

      @@peaceinmoto4022 aurat ka chakkar hai babu bhaiya, aurat ka 😂😂

    • @peaceinmoto4022
      @peaceinmoto4022 3 роки тому +3

      @@07.sparkz na Bhai tumlog ek ladki aur ladka ka resta ko negative side sey dekh rahe ho wo Meri behan ho sakti hai

    • @yogeshgahlawat2868
      @yogeshgahlawat2868 3 роки тому +2

      Bye in comparison of hii

    • @07.sparkz
      @07.sparkz 3 роки тому

      @@yogeshgahlawat2868 😂😂

  • @the.enchantresss
    @the.enchantresss 4 роки тому +12

    Thank you so much! This helped me a lot in my physics exam

  • @mantashakhan3900
    @mantashakhan3900 Рік тому +7

    Class x icse board students to PHYSICS WALLAH ..tum jo aaye jindagi me baat bn gyi♥️

  • @Medsss_17
    @Medsss_17 9 місяців тому +2

    We all may have new facilities to study, new teachers with smart boards and all.. But still all we do is to come and understand the concepts from these old and nostalgic lectures.. ❤

  • @haniahania650
    @haniahania650 4 роки тому +3

    You are the best teacher
    You always clear all the concept in the first time I don't need to repeat and repeat the video for concept clearing
    Thank you sir
    God bless you

  • @study3564
    @study3564 5 років тому +15

    Sir. Whatever be your way of teaching, you're truly an inspiration. You teach so so so well, sir. Keep doing this, sir. Thank you so much sir.

  • @murshidalam8787
    @murshidalam8787 4 роки тому +13

    I forgot that's English version of our Alakh sir. Looking slim & more handsome sir.😆

  • @ExplorerHere1
    @ExplorerHere1 2 роки тому +3

    I am from future to tell you that you are 101 unicorn startup in 2022 and most likeable educational platform of INDIA 'PW' 🎉🎉🎉🎉🎉🎉🎇🎆🎆

  • @SandeepKumar-oo7hn
    @SandeepKumar-oo7hn 5 років тому +6

    Best teacher ever I seen

  • @sauravyadav2034
    @sauravyadav2034 4 роки тому +3

    All doubts and confusion clear sir from this video thank you so much sir👍👍👍👍👍👍👍

  • @amandon1756
    @amandon1756 6 років тому +6

    Sir,you are better than all

  • @goblin44490
    @goblin44490 4 роки тому +4

    Sir maine aapka light chapter full 1 hour wala dekha tha ... earlier I thought that this ch was very difficult ... but after watching the whole video vo ch mere liye halwa ho gaya ... Image formation toa halwa ka bhi halwa ho gaya ... Your explanation and way of teaching is very amazing all over UA-cam. 🔥🔥🔥🔥🙏🙏🙏🙏🙏🙏🇮🇳

    • @godson200
      @godson200 4 роки тому

      I would suggest ki tum ray optics ke class 12 ke lectures bhi dekh lo agar interest ho toh.. It is really easy the way he explains it... It is really best to study geometrical optics in class 10 only as geometry is not taught after class 10 in maths..

  • @bhavyainskyward3776
    @bhavyainskyward3776 3 роки тому +3

    After seeing your video lens numericals are crystal clear sir😀... Great Job sir👍🙏

  • @kalyanitewari
    @kalyanitewari 5 років тому +10

    I'm watching this before my exam sir
    We don't get enough for preparation and you are my only hope
    Thank you so much ❤️❤️

  • @SiyaKapoor16
    @SiyaKapoor16 10 місяців тому +3

    East or West,,Physics Wallah is the best 👌 👍 😍

  • @learnopediaplus9086
    @learnopediaplus9086 2 роки тому +1

    CGL aspirant is here in this channel. Thanks bhai to clear my concepts. I was really getting confused about the sign conventions.

  • @lovelycreation7million679
    @lovelycreation7million679 4 роки тому +27

    😊Thanks sir for being here for us... your work is appreciable😊☺...

  • @hwlcec5344
    @hwlcec5344 3 роки тому +2

    he is not well but still teachng...thats why he has so much love now,,....always in the cushion of our love

  • @sidneet.786
    @sidneet.786 5 років тому +6

    Your teaching is awesome sir😊

  • @english-wallahraviprajapat7805
    @english-wallahraviprajapat7805 4 роки тому +17

    Wow what an wonderful explanation it was. Thanks a lot Sir.🙏🙏🧠🧠

  • @indrajeetbanerjee3893
    @indrajeetbanerjee3893 6 років тому +5

    We should be grateful to him because he teaches free of cost.

  • @jainsamjiju4204
    @jainsamjiju4204 4 роки тому +2

    good explanation............ur classes are awesome..if everyone in india watch ur videos its sure that they will get full marks in all the examss.

    • @jainsamjiju4204
      @jainsamjiju4204 4 роки тому

      thanks for ........... giving us awesome videos like this .
      keep uploading

  • @Suejeudgsidjdj
    @Suejeudgsidjdj 8 місяців тому +7

    Tomorrow is my physics board and now I have started to study 😅

    • @whome.sanchi
      @whome.sanchi 8 місяців тому +1

      Same 💀

    • @saransh_0001
      @saransh_0001 8 місяців тому +1

      ​@@whome.sanchikal ke exam mein lagta hai fail 😢😢

  • @sunitakhandagale1081
    @sunitakhandagale1081 5 років тому +4

    Best teacher for every student😄😄

  • @kadambinibhuyan4021
    @kadambinibhuyan4021 4 роки тому +5

    Excellent way of explaining sir. Great job!!

  • @shashankdubey3460
    @shashankdubey3460 4 роки тому +2

    Sir I love your way of teaching and explanation

  • @yashuwu09010
    @yashuwu09010 3 роки тому +3

    Beat explanation sir , it's amazing sir you make theory crystal clear like diamond, salute you sir, hats off sir for your explanation

  • @sarithaprabhu17
    @sarithaprabhu17 3 роки тому +4

    You are such a great teacher. Thank you so much.

  • @someoneyoudontknow3192
    @someoneyoudontknow3192 5 років тому +9

    Sir 1 million ki bht badhai👍

  • @ManishPatel-zk5fs
    @ManishPatel-zk5fs 3 роки тому +1

    Focal length of concave mirror is always positive because principal focus lies in front of mirror

  • @a.snehaarts
    @a.snehaarts 3 роки тому +12

    * 😢Normal watched 3 years ago
    * 🤓Legend s watched in 1year ago
    * 😎Ultra pro Legends Max are watching in 2021😂

  • @ethanlane5595
    @ethanlane5595 6 років тому +12

    Sir please tell me that why we take 1/f,1/V and 1/u? why we take one above the spherical mirror or lens terms? If we not take one then what problem will create..????

    • @tecksonthevibranium8206
      @tecksonthevibranium8206 4 роки тому

      Answer nahi milega

    • @jaggajasoos3276
      @jaggajasoos3276 4 роки тому +2

      Vo indian Christian bhi to ho sakta hai

    • @godson200
      @godson200 4 роки тому

      It is just derived in latest video of ray optics 1 year ago... You can see how it is derived

  • @amrindersingh6588
    @amrindersingh6588 8 місяців тому +10

    Legend watch one day before board exam 😂

  • @ramprasadgupta9785
    @ramprasadgupta9785 6 років тому +1

    i subscribed u when u were having 1k but now very happy to see your 200+k subscriber

  • @motivationbylegends6684
    @motivationbylegends6684 4 роки тому +4

    I think this is the shortest lecture of Alakh sir for phyics lecture 😀😀😀

  • @Ahuman43
    @Ahuman43 2 роки тому +1

    Yar! Thank you so much sir! I was confused in magnification part in lens and if I hadn’t seen this video I would have refer my class work and I have written ulta pulta! Thank god I found mistake and corrected it! I can’t thank you enough. Last exam I got 15/16 because of you and intact I bunked my school for whole month so teacher was impressed of me! Thank you again, tommrow I have again exam. Wish me good luck.

  • @abhinav8bpyt549
    @abhinav8bpyt549 4 роки тому +3

    SUPER DUPER LECTURE I LOVE IT THANK U SIR.

  • @pentapalliganasaivathsav8591
    @pentapalliganasaivathsav8591 4 роки тому +2

    Thankyou for clearing my doubt 🙏🏻

  • @jhanavisabharwal7452
    @jhanavisabharwal7452 5 років тому +8

    Maine video mirror se lens ka bdla aur sir ne to India ko usa se bdl Diya...😂
    Btw nice explanation as always

  • @Rajendrasingh-u2v
    @Rajendrasingh-u2v Рік тому +1

    I have doubts but after watching this video I have no doubts thankyou so much sir

  • @gaurabdeb2091
    @gaurabdeb2091 5 років тому +7

    Love to watch your videos. Btw i m a mathematician but due to TET exam i hv to summarise all the things of physics what i hd learn... N then i search on youtube n then gt ur tutorial.. Like it bro...

  • @jasmithareddy581
    @jasmithareddy581 3 роки тому +1

    i am so thankful to you sir . I have watched many videos about sign conventions but i did not understand. But now I understood . Thanks a lot sir..........

  • @ananyakishore4970
    @ananyakishore4970 6 років тому +17

    Sir please do make a video explaining about magnifying class and application of lenses.. Ur lessons r very helpful!

    • @samboy6467
      @samboy6467 Рік тому

      bhaiya apni 10th me kitni ayi?

  • @SatyamKumar-ly6mx
    @SatyamKumar-ly6mx 3 роки тому +1

    Sir you are amazing . You are the best teacher in the universe.

  • @tikan6170
    @tikan6170 5 років тому +3

    Thank you sir, you cleared all my doubts on sign convention

  • @studyaddictors8469
    @studyaddictors8469 4 роки тому +1

    Yours best thing in explantion is that you tell all concepts in hindi...
    Please try to speak in hindi dont change your language

  • @tanishkbajpai07
    @tanishkbajpai07 8 місяців тому +6

    Tomorrow is my boards 2024 batch 🙌🏻

  • @bibekanandapadhi2670
    @bibekanandapadhi2670 4 роки тому +1

    Sir you are the greatest teacher ever I had seen in my life

  • @Arihant8545
    @Arihant8545 6 років тому +34

    1:18 oho Jeeb nikalta hai

  • @shobhamehta1296
    @shobhamehta1296 2 роки тому +2

    Superb explanation
    Can you please explain when magnification is taken positive and negative..?

    • @areditz937
      @areditz937 Рік тому

      When image is inverted(real), then magnification is taken in negative.
      And in the case of erect(virtual), then magnification is taken in positive

  • @sahila9715
    @sahila9715 5 років тому +3

    Loved ur teaching Sir... I'm very happy..

  • @jayendrapatel593
    @jayendrapatel593 4 роки тому +2

    Best teacher for CBSE and iitjee

  • @D.I-BPSC
    @D.I-BPSC 7 місяців тому +12

    2024--2025 Batch🤚🤚

  • @NehaGupta-zk1zt
    @NehaGupta-zk1zt 5 років тому +1

    Sare comment chod dijiye sir apko nahi pata shayad ,lekin you are like miracle in my life. You have changed a failure like me in topper in physics .Thank you

  • @warrior7774
    @warrior7774 4 роки тому +4

    I just do not understand why such educational videos from the best teacher do not come in trending section😭😭

  • @yadunathsingh5646
    @yadunathsingh5646 3 роки тому

    Sir teaching amazing 3 year before.. And after 3 also.. Teaching like pro teacher...

  • @funtime-tz5yb
    @funtime-tz5yb Рік тому +3

    Thanks very helpful for me

  • @aarnachopdekar9490
    @aarnachopdekar9490 3 роки тому +2

    Sir you made something which looked difficult for me so easy

  • @komaldesai07
    @komaldesai07 Рік тому +19

    2023 student anyone !?

  • @v.m.pathakvideo6811
    @v.m.pathakvideo6811 4 роки тому +2

    Thank you for clearing my doubt

  • @kirtiambasta5320
    @kirtiambasta5320 Рік тому +6

    This video is still very handy even after 6 years😊😊

  • @theinfotainment.
    @theinfotainment. 4 роки тому +2

    Sir ,very well doing a great job
    Fabulous never see a teacher like you

  • @HarikeshKushwaha-qk5uc
    @HarikeshKushwaha-qk5uc Рік тому +3

    Mai to Sir ko Itna famous hone ke baad dekh raha hu
    ❤😊
    Aab to Sir ki Sadi bhi ho gayi hai 😁
    8 November 2023😊

  • @Bibek5559
    @Bibek5559 6 місяців тому +1

    Sir your English speaking is too good ❤😊😊😊

  • @7clouds567
    @7clouds567 2 роки тому +4

    Who knew that this man will own 1.2B $ ed tech company today!

  • @biswamberbaghasingh5515
    @biswamberbaghasingh5515 4 роки тому +1

    sir in 10 minutes video u gave us a lot of knowledge

  • @nitinsahu3368
    @nitinsahu3368 5 років тому +6

    Sir u r not human u r super human

  • @uzmakhadeeruzma3720
    @uzmakhadeeruzma3720 3 роки тому +1

    Who is here in 2021
    after getting confused in online classes
    The way he is explaining it is directly going into the mind😊

  • @PETER-pb8yw
    @PETER-pb8yw 4 роки тому +5

    We can see the direction of light in board 😁 4:17

  • @KingPeeyush.
    @KingPeeyush. Рік тому +2

    Today is my entrance exam. Believe in Alakh Sir

  • @BalrajSandhu-oo9do
    @BalrajSandhu-oo9do 6 місяців тому +15

    2024-2025 batch 👉👉

  • @adharshsuresh7805
    @adharshsuresh7805 5 років тому +3

    We'll congratulations sir on your achievement sir thank you