LIGHT - REFLECTION & REFRACTION - Most Important Questions | Class - 10th

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  • Опубліковано 20 січ 2025

КОМЕНТАРІ • 960

  • @PW-Foundation
    @PW-Foundation  2 роки тому +117

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  • @SanjuDevi-hy2zd
    @SanjuDevi-hy2zd 2 роки тому +81

    39:45
    The phenomenon due to which left hand of the object is appear as right hand of the image and vice versa this phenomenon is known as lateral inversion

  • @niyamgiri32
    @niyamgiri32 10 місяців тому +7

    54:15 after seeing this question i was like:- ohh bhai yeh toh vedantu ke sir ne bhi karaya tha 😂😂😂

  • @Alnoorkitchen03
    @Alnoorkitchen03 Рік тому +5

    Sir 1:34:00 the lcm of 10,15 is 30 not 150 so v=-15 not -30 … btw u are the bestest sir 💖

    • @momo888yt4
      @momo888yt4 Рік тому +2

      Bro nhi sahi kra ha agar 30 LCM lenge to dekho...
      1/-10= 1/v + (-1/15)
      1/-10 = 1/v - 1/15
      1/-10 + 1/15 = 1/v
      Take LCM 30 then...
      =-3+2/30
      = -1/30 = 1/v
      Therefore... V = -30
      Clear bruda... ❣️❣️

    • @Alnoorkitchen03
      @Alnoorkitchen03 Рік тому +1

      @@momo888yt4 hmm kk

  • @jitendrasharma5032
    @jitendrasharma5032 2 роки тому +189

    Physics wallah is a good platform in India for teaching

  • @integration_IIT_ISM
    @integration_IIT_ISM Рік тому +8

    1:23:52 sir in this question why did you take V=-30 ??
    It can alse be +30 if image formed behind the mirror ??? Please clear if anyone know !!

    • @itsokreally7672
      @itsokreally7672 Рік тому +1

      I thought the same cuz taking V=-30cm gives u=-12 which is b/w F and P

    • @AtharvaKhade-o4c
      @AtharvaKhade-o4c 3 місяці тому

      Are just see the type

  • @manojkumar-pf3hk
    @manojkumar-pf3hk Рік тому +6

    sir 1:26:02, how the "v" is taken as (-), concave mirror posses either virtual image orr real image..... toh yaha per toh dono case posible hai n....

  • @nainakumari7638
    @nainakumari7638 11 місяців тому +5

    7:18 sir jb light ray denser se rarer me jata h then it will bend away the normal ....uski taraf bend nhi hoga sir ....

  • @akshatupadhyay6360
    @akshatupadhyay6360 Рік тому +7

    39:55 Lateral Inversion is the property of a mirror which shows left side of the object right and vice versa when image is formed.

  • @NovaNodee
    @NovaNodee 6 місяців тому +2

    52:09 😮😮😮

  • @Anirudhraushan03
    @Anirudhraushan03 2 роки тому +29

    All concepts clear sir.... 🔥🔥🔥🔥🔥🔥 thankyou so much... Sir 😇☺☺

  • @ArishAlam-mv5rz
    @ArishAlam-mv5rz Рік тому +7

    49:57 he said image is virtual and erect but when magnification is in minus the image is real and inverted. 49:59

  • @vaijnathyadav210
    @vaijnathyadav210 2 роки тому +10

    53:01
    The ratio will be negative 1 (-1)
    Because AB will behave live convex mirror, Its focal length will be psoitive
    CD will behave as concave mirror
    Its focal length will be negative
    -f/f=-1

  • @Tanisha.sinha26
    @Tanisha.sinha26 11 місяців тому +3

    1:39:33 😮

  • @atharva_baalveer
    @atharva_baalveer 2 роки тому +4

    3:44 convex lens

  • @Lan_aria
    @Lan_aria Рік тому +2

    11:56 the magnification of the image will be unity bcoz image formed by plane mirror is same size of an object

  • @samayjeeair1
    @samayjeeair1 2 роки тому +15

    laterally inverted means that image formed by mirror appears in the opposite direction of the object
    ex: AMBULANCE

  • @btan7258
    @btan7258 Рік тому +2

    1:27:15 Height of image should be -2

  • @SumitKumar-xu4vj
    @SumitKumar-xu4vj 2 роки тому +122

    PW is not just give an enormous power. It's give us an power to do anything from everything ❤️❤️

    • @chandrakalasharma4524
      @chandrakalasharma4524 Рік тому +1

      Bro, this is more appropriate to say :-
      Anything from the least or everything from Anything ,,
      ,,, I am Akul

  • @swastik5699
    @swastik5699 2 роки тому +2

    55:48 . Sir idher U (obj dis) will b -tive as it in the LHS of the mirror

  • @Anjali-uf8nl
    @Anjali-uf8nl 2 роки тому +5

    Pwf is world best platform in the world......😍😍all concepts were vey clearly explained...

  • @Kiraeditz696
    @Kiraeditz696 2 роки тому +10

    1:23:31 doubt🤔❌❌❌🔴🔴🔴👋👋👋👋
    Sir, aap ne image distance ko +ve kyu nahi liye
    ABKO kaise pata chala ki image left side h, right side nahi.
    Sir, v ko +ve bhi to le sakte h na kyu ki question me ye nahi diya ha ki 😅 image real h ya virtual.

    • @vaishh14
      @vaishh14 2 роки тому +1

      YES EXACTLY, EVEN I'M HAVING THE SAME DOUBT!!!

    • @sciencehow9172
      @sciencehow9172 2 роки тому +1

      Thanks Bro For Pointing Out

    • @ishrat-educationdisaster.1471
      @ishrat-educationdisaster.1471 2 роки тому

      Bro object distance is always negative both in mirror and lens...

    • @Kiraeditz696
      @Kiraeditz696 2 роки тому

      @@ishrat-educationdisaster.1471
      No!
      6th case me v +ve hota hai

    • @ishrat-educationdisaster.1471
      @ishrat-educationdisaster.1471 2 роки тому

      @@Kiraeditz696 you're talking about v... And u is always negative because we put our object left side of mirror and lens both! "
      Oky it's your doubt.. I was just telling uou

  • @SurenderSingh-pz4ou
    @SurenderSingh-pz4ou Рік тому +31

    Teaching with patience is also a task but is not task for Pw .
    Because Itne patience ke sath puri information dena about question Not miss a single point .
    Really Pw doing Hardwork for all Students And Jo Chapter School Mai samjhne mai 2 Months Near about lag jaata hai vahi Kuch Hours mai Hm physics wallah se samajh sakte hai Better than Coaching , or school According to me

  • @KhushiMaurya-xn3mm
    @KhushiMaurya-xn3mm 4 місяці тому +1

    1:24:15 because we find (u)

  • @vijayparashar5295
    @vijayparashar5295 2 роки тому +13

    Thank you very much sir🤗 because of you sir my all doubts of numericals will crystal clear.👍I am really thankful to you sir that you will give us this video ❣

  • @Rushi386.
    @Rushi386. 2 роки тому +8

    Sir u boosted a new level of confidence in me 🙏 Love u sir 😘😘❤️❤️❤️❤️

  • @manish_krishnavanshi1888
    @manish_krishnavanshi1888 2 роки тому +8

    Sabhi concept clear ho gaye aur maja bhi aya Dil se sukriya sir 💝💝

  • @Shubheditzz7
    @Shubheditzz7 2 роки тому +17

    Wonderful Session Alok Bhaiya

  • @Suryabhai-b1n
    @Suryabhai-b1n 2 роки тому +2

    you are so cool sir your explanations is amazing best teacher of physics💫💫💫💫💫💫

  • @devsaini6345
    @devsaini6345 2 роки тому +4

    This video is Very helpful for me
    Thanku so much sir ji 🙏..

  • @emperor7847
    @emperor7847 Рік тому +3

    20:00 sir shouldn't we solve by using mirror formula for characteristics?

  • @manionduty1
    @manionduty1 Рік тому +3

    39:54 Laterally Inverted Means It Shows Left Instead Of Right and Right Instead Of Left :)

  • @chintubal5665
    @chintubal5665 Рік тому +1

    1:33:49 lcm of 10 and 15 is 30

  • @NikhilYadav-do3gt
    @NikhilYadav-do3gt 2 роки тому +26

    All concepts clear 👍..
    Thank you sir 🔥
    Please next chapter magnetic effect of electric current.. 🙏

  • @atharvsingh4708
    @atharvsingh4708 Рік тому +2

    1:33:45 sir lcm of 15 and 10 is 30 😑

    • @atharvsingh4708
      @atharvsingh4708 Рік тому

      ​@@sushmayadav1045galat hai fast nahi answer alag aaraha hai 😑

  • @aayushikumari2880
    @aayushikumari2880 Рік тому +3

    1:10:54:-converging mirror

  • @PriyambadaPandey-q3b
    @PriyambadaPandey-q3b 2 місяці тому +3

    Thank you sir sir sare chapters ka yese hi important questions Kara dijiye

  • @abhishekarora8919
    @abhishekarora8919 2 роки тому +3

    1:25:00 can't v be +ve as well in this case?

    • @adityarawat3968
      @adityarawat3968 2 роки тому +1

      Noo how come v can be positive 😪

    • @abhishekarora8919
      @abhishekarora8919 2 роки тому +1

      @@adityarawat3968 "so that it forms an image at a distance of 30 cm from the mirror" image ki koi characteristic nhi mentioned hai so how can you make out that image left mein hi banegi? This question has 2 cases

    • @anybodycanmonukumar7996
      @anybodycanmonukumar7996 2 роки тому

      @@abhishekarora8919 bhai tum samjha rahe ho yaa self doubt me ho

    • @abhishekarora8919
      @abhishekarora8919 2 роки тому

      @@anybodycanmonukumar7996 samjha rha

    • @adityarawat3968
      @adityarawat3968 2 роки тому

      @@abhishekarora8919 haan bro ab mai smjha tumhe from the mirror me confusion hai.....dekho jabbhi exam me aaye "from the mirror" tb samajh lena negetive diya h....."beyond the mirror" ka matlab positive

  • @prajjawaltiwari9566
    @prajjawaltiwari9566 Рік тому +1

    18:07 sir 4th wale me laterally inverted hoga....

  • @suhanighanchi6145
    @suhanighanchi6145 Рік тому +9

    First I was very much worried about my preparation but when I solved all these questions correctly I got confidence, thanks sir for these questions

  • @shubhampandit5658
    @shubhampandit5658 Рік тому +1

    11:14 sir ma laddo nahi khaata 🤣🤣

  • @akshorts7940
    @akshorts7940 Рік тому +1

    When magnification in minus ( - ) then the image always real and inverted 51:20

  • @ishitasingh6545
    @ishitasingh6545 5 місяців тому +46

    Any student of 2025 🙋‍♀️🙋‍♀️🙋‍♀️🙋‍♀️🙋‍♀️🙋‍♀️

  • @pwians.....
    @pwians..... 2 роки тому +2

    Thanku ❤️❤️...... so much sir 💜💜

  • @abhisheksinger273
    @abhisheksinger273 2 роки тому +4

    I am love physics and physics is my life

  • @rajpandey977
    @rajpandey977 2 роки тому +19

    Thank you sir this gave me a boost in my confidence 💕

  • @dhirendrasingh1649
    @dhirendrasingh1649 2 роки тому +2

    At 20:32 sir here we could also write m=1 ?

  • @Praveen_kumar05
    @Praveen_kumar05 2 роки тому +3

    Sir ye sara questions hum subha me hi banaye the aaj
    Thanx sir mera ek baar aur revision ho gaya 🥰🥰🥰🥰🥰🤗🤗🤗🤗🥰🤗🥰🤗🥰🤗

  • @mantradesai6787
    @mantradesai6787 Рік тому +1

    9:18
    It is maybe wrong
    Because concave lens having focal length 0.25
    Is -0.25 because it is concave mirror
    So
    P=1/f
    -4= 1/-0.25
    So is is right 👍🏻

    • @aarushhuh
      @aarushhuh Місяць тому

      But focal length sarre options mai +ve aur same hai, -ve kaha hai?

  • @ji_ayush_ji
    @ji_ayush_ji 2 роки тому +4

    Maja aa gya sir thanku ab fir sa 1 baar khud sa sab question banaunga ☺️

  • @RamprashadSharma-i4i
    @RamprashadSharma-i4i Рік тому +1

    39:57 visa versa of image

  • @Shinewithglow-s5b
    @Shinewithglow-s5b Рік тому +8

    Lateral inversion - Left appears right and right appears left in plane mirror

  • @RTO76484
    @RTO76484 Місяць тому +1

    Outstanding academic work aswell as explanation next level up , sir write ❤❤🔥🔥🔥🔥

  • @Sandy_Sparks_
    @Sandy_Sparks_ 2 роки тому +2

    MAGNETIC EFFECTS 🧲 🧲 CHAPTER MOST IMPORTANT QUESTION JALD UPLOAD KAREYE SIR ! PLZ 🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻✍🏻🙏🏻 EXAM START HONE WALE HAI PRE-BOARD

  • @ShlokChikne
    @ShlokChikne Рік тому +7

    Great Explanation best of luck everyone ❤️

  • @priyanautiyal453
    @priyanautiyal453 2 роки тому +1

    1:07:10 sir we will use lens formula and the image will be formed beyond 2F (positive side) ?????????🤔

  • @palakrajput5395
    @palakrajput5395 2 роки тому +5

    Thanks for the amazing session sir... Finally I have revised Light chapter..!!
    Now no doubt in this chapter 🙂🙂

    • @-motivation_videos-by_dk-
      @-motivation_videos-by_dk- 2 роки тому +1

      Hii

    • @shubhampandit5658
      @shubhampandit5658 Рік тому

      @Palak Rajput To fir ye bta do
      List four precautions which a student should observe while determining the focal length of a
      given convex lens by obtaining an image of a distant object on a screen.

    • @-motivation_videos-by_dk-
      @-motivation_videos-by_dk- Рік тому

      @ʀᴏʜɪᴛ yes bro mistake ho gya

  • @aishikkumarmaiti9282
    @aishikkumarmaiti9282 Рік тому +2

    49:55, sir, the question doesn't instruct to inform about the mirror in detail. The question asks to sum up four observations or understandings from the given statement about the image/mirror.

    • @AayanYamkanmardi
      @AayanYamkanmardi Рік тому +1

      That question was solved totally wrong.
      If it is -3 ...then the image must be real, inverted & enlarged .

  • @iawesome224
    @iawesome224 Рік тому +8

    Best physics mentor hence proved.

  • @BalikaMulge
    @BalikaMulge 5 місяців тому +2

    magnification of spherical mirrors is -v/u

  • @Shivamyadav-dt2fx
    @Shivamyadav-dt2fx 2 роки тому +3

    Thank you my confidence is higher high❤❤❤❤❤❤

  • @allinone0718
    @allinone0718 2 роки тому +4

    HI I AM FAROOQUI MOHAMMAD UMAIR FROM MARUL DISTRICT JALGAON MAHARASHTRA INDIA 🇮🇳🇮🇳🔥🔥❣️❣️

  • @BalkishanSastri
    @BalkishanSastri Рік тому +10

    2024 students attendence laga do ❤❤😂😂

  • @pratibhasingh4828
    @pratibhasingh4828 2 роки тому +11

    I really feel confident after completing this question. It is very helpful for us.keep it up...👌👍

  • @Rayray..093
    @Rayray..093 Рік тому +3

    Amazing session sir thank you so much🙏

  • @khyati2272
    @khyati2272 2 роки тому +4

    Sir pls next video on ch magnetic effect of electric current

  • @ajeetrai7336
    @ajeetrai7336 2 роки тому +3

    Sare chapter's clear ho gye bhyia ji ...thank you

  • @faatiarts1617
    @faatiarts1617 2 роки тому +3

    an object is placed at distance of 8cm infront of concave mirror of focal length 16 cm . find the position of mirror and draw ray diagram

  • @yashdnyaneshwarkoli786
    @yashdnyaneshwarkoli786 Рік тому +1

    25:56 sir upar likha he 😅

  • @9danujjalakhera37
    @9danujjalakhera37 2 роки тому +2

    Thank you sir sb revise ho gya🎉🙂

  • @puplover533
    @puplover533 Рік тому +2

    sir, in 24:02 can't we do it by the formula?

  • @Nisha_prashant
    @Nisha_prashant 7 місяців тому +1

    24:01 sir cancave mirror ka image nature hai vi real and inverted hai na ki virtual and erect

  • @chandramohanprasad9779
    @chandramohanprasad9779 2 роки тому +1

    Mirror me , magnification = -v/u hoga sir
    10:42

    • @dontommy5325
      @dontommy5325 2 роки тому

      Plane mirror h na ki concave mirror

  • @tarakshbagla3517
    @tarakshbagla3517 2 роки тому +11

    Thank You Sir. Your lecture was amazing and is really helpful for our revision of the chapter.

  • @vedantsrivastava5484
    @vedantsrivastava5484 Рік тому +1

    01:41:37
    Sir yaha pe sin i = sir r nhi hoga ye galat h

  • @ManishManish-pv5gt
    @ManishManish-pv5gt 2 роки тому +5

    Alok sir is the best teacher of physics

  • @swastik5699
    @swastik5699 2 роки тому +1

    1:10:18
    Just a time stamp for myself.. others may ignore

  • @kartikeyverma5330
    @kartikeyverma5330 2 роки тому +1

    20:05 when image form behind the mirror that is enlarged not diminished

    • @lakshaypanchal1300
      @lakshaypanchal1300 Рік тому

      Image will be diminished because convex mirror always forms diminished image check the rule once

  • @_vedansh_228__
    @_vedansh_228__ Рік тому +4

    refractive index of a medium with respect to air/vaccum is known as absolute refractive index

  • @aryandhiman9992
    @aryandhiman9992 Рік тому +1

    Maja aa gaya sir saare questions Bane ❤❤🎉🎉

  • @Abhinav_kr18
    @Abhinav_kr18 2 роки тому +5

    Q no. 1 - convex lens

  • @kanikachoudhary6892
    @kanikachoudhary6892 Рік тому

    1:23:29 v positive aur negative Dono ho skta h

  • @student_80
    @student_80 2 роки тому +4

    Thank you🙏 for this series MIQ

  • @diya5469
    @diya5469 Рік тому +3

    In the second question the line marked as normal is actually principal axis and the light ray is bending away from normal i.e moving from denser to rarer.

  • @sandycreation2309
    @sandycreation2309 2 роки тому +2

    MAGNETIC EFFECTS CHAPTER MOST IMPORTANT QUESTION JALD UPLOAD KAREYE SIR ! PLZ 🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻✍🏻🙏🏻 EXAM START HONE WALE HAI PRE-BOARD

  • @creators191
    @creators191 2 роки тому +4

    Hello sir, I am Yash Jain.
    I have a doubt related to physics(human eye and the colourful world), as we all know because of scattering of light, the sun's ray's light appears to be yellow, but in actual the sun's ray's lights are of white colour, but why, when the light which is coming from moon at night doesn't appears to be yellow?

    • @vyasprasad8517
      @vyasprasad8517 2 роки тому +3

      Bcz moonlight ka intensity km h

    • @arya7rish
      @arya7rish 9 місяців тому

      distance bhi matter karti hein bro

  • @itsokreally7672
    @itsokreally7672 Рік тому

    1:23:39 sir v +ve bhi ho sakta hai kyuki hame nhi pata object Kahan hai ,wo F and P ke beech Mai bhi ho sakta hai

    • @Shinefx13
      @Shinefx13 Рік тому

      Yes right ✅️

    • @Shinefx13
      @Shinefx13 Рік тому

      Agar concave mirror ki jagah lens Rahe to negative ho sakti hai

  • @taestheworld2499
    @taestheworld2499 2 роки тому +5

    Thank you so much sir for amazing lacture 🥰✨

  • @missindiashivi416
    @missindiashivi416 Рік тому +2

    Bhout maja aaya sir numericals solve krne main thank you so much sir 🥰👍👍👍👍👍

  • @deekshachandra3619
    @deekshachandra3619 2 роки тому +13

    Non-stop video dekhi maine aaj with no break🤝🏻😎

  • @Mansi42224
    @Mansi42224 Рік тому +1

    Thank you sir giving to best platform 🥰🥰🥰🥰🔥🔥🔥🔥🔥🔥🔥🔥🔥

  • @Prashant-v3e
    @Prashant-v3e Рік тому +9

    I pray to God, may all the students get their desired marks 🙏🙏🙏

  • @phantomx2036
    @phantomx2036 Рік тому +1

    50:52 sir the image formed is diminished as m

    • @akaza8430
      @akaza8430 Рік тому

      It's enlarged since 3>1

    • @akaza8430
      @akaza8430 Рік тому

      If it comes anything between -1 to 0.10, then only its diminished

    • @phantomx2036
      @phantomx2036 Рік тому

      It's -3

    • @phantomx2036
      @phantomx2036 Рік тому

      I think it's m= 1 then it's same size m>1 then enlarged and m

    • @phantomx2036
      @phantomx2036 Рік тому

      Or does -ve doesn't matter at all

  • @sanjanagupta7947
    @sanjanagupta7947 2 роки тому +3

    Sir pls jaldi se or dusre ch ke bhi video bano

  • @themathical9976
    @themathical9976 2 роки тому +5

    Amazing sir
    Everything is clear
    Please tell Sunil sir to bring such a video for metal & non metals🙏😁👍👍👍👍👍

  • @Sudhir69127
    @Sudhir69127 2 роки тому +1

    Nice explanation of all question🙂

  • @tejashwathakur8661
    @tejashwathakur8661 2 роки тому +4

    Very Very useful session. Thank you sir for this PYQs lecture💓💓

  • @twinstar9892
    @twinstar9892 Рік тому +1

    2:37 question 1

  • @samarsinghyadav9609
    @samarsinghyadav9609 2 роки тому +3

    Lateral inversion is a situation when LHS become rhs or vice versa

  • @acousticshubhamjaishwal7105
    @acousticshubhamjaishwal7105 2 роки тому +2

    Thankyou so much sir 💕