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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. Sir how can you say image will be at (-1,2) only bc there are many other pt above mirror which are at same dist from the mirror wrt obj dist from the mirror
    6 months ago by

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  2.  
    3. Sir what is the radius of the circle formed by images if the the object is placed at any point other than bisector at the distance x
    8 months ago by

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  3.  
    4. Solution to q set pl
    8 months ago by Kedar Pathak

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  4.  
    5. Sir then if a real object is placed in front of a plane mirror and it's image is produced in mirror which is virtual now if we put another mirror in front of that mirror will we get the image as virtual or real?if real then can we project it on screen?
    10 months ago by Jayesh Ingale

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  5.  
    6. op
    1 years ago by

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  6.  
    7. Sir you have not completed some important topics too when mirror is moving etc. which is given in book and quizes but i am unable to get concept of those ????????
    2 years ago by

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  7.  
    8. Best place for concept
    2 years ago by Santosh kumar

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  8.  
    9. The answer for QuSet - 1 q1 should be B but it is given A
    3 years ago by

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  9.  
    10. Sir is it possible to get the solutions of QuSets
    3 years ago by

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  10.  
    11. why we subtract the velocities in perpendicular velocity section
    3 years ago by Ishan Dhamija

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  11.  
    12. Why we don't use the concept of module 12, which is "minimum length of mirror required to see self-image". what happens when we switch the self-image to the size of the wall i.e. 3m. hope you understand what i am saying.
    3 years ago by Ishan Dhamija

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  12.  
    13. Dis. Of object = - dis. of image
    3 years ago by Sanjeev Tiwari

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  13.  
    14. What is IR cap, N cap, RR cap
    3 years ago by Sanjeev Tiwari

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  14.  
    15. Sir,how we decided focal lengths of these mirrors?
    3 years ago by

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  15.  
    16. Sir, how do we know that the perpendicular from source(1,0) to the mirror will pass through point(0,1)?
    3 years ago by Savneet kour

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  16.  
    17. do you teach srg batch
    4 years ago by

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  17.  
    18. but he wont be able to see his image
    4 years ago by

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  18.  
    19. sir, where we will find the topic 'cutting of a mirror'.
    4 years ago by

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  19.  
    20. sir really well explain,pura ek hi video banao saare jodke
    4 years ago by Amol Jadhav

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  20.  
    21. When a light ray fall on plane mirror or lnclined plane mirror or shperical mirror then how do we know that in which direction reflected ray will reflect
    5 years ago by undefined

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  21.  
    22. sir can u plz suggest me a book for neet
    5 years ago by Happy Purohit

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  22.  
    23. How you are considering that there will be no velocity in X&Y direction as it is moving along XY plane
    5 years ago by D Saranathan

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  23.  
    24. not working
    5 years ago by Mohak Bhatia

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  24.  
    25. sir ye lectures boards k liye v benificitials honge na..
    5 years ago by Saurav Tiwari
    Ans 1 ->
    Yes but you have see derivation from other sources
    5 years ago by undefined

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  25.  
    26. is the image is formed when two rays from different object intersect each other?
    5 years ago by Kushal Gupta

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  26.  
    27. Define image. is it illusion
    5 years ago by Raghav

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  27.  
    28. what is a ray of a light
    5 years ago by Kushal Gupta
    Ans 1 ->
    oh sorry i find my answer in next lecture
    5 years ago by Kushal Gupta

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  28.  
    29. Sir how can I find solutions of queset questions where I stuck pls sir help me.
    5 years ago by Ravi Garg

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  29.  
    30. Thanks Sir..
    5 years ago by SUMA RAO

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  30.  
    31. Can diffused reflection be also called irregular reflection?
    6 years ago by Prakash Raj

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  31.  
    32. Please give solutions of question 5 and question 8 in queset 1 of reflection of light
    6 years ago by snehil verma

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  32.  
    33. This is the same as the types of objects
    6 years ago by Yukti Khosla

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  33.  
    34. sir can you please make a video where the object is unsymmetrically placed between two mirrors at an angle theta
    6 years ago by ABHISHEK SHANKAR

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  34.  
    35. sir i didnt get the similarity part. please explain, as the triangles ABC and DEC are not righ angled.
    6 years ago by shrijeet shivdekar

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  35.  
    36. Sir, I didn't get how you applied the similarity? Which two triangles are similar here?
    7 years ago by Harish D

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  36.  
    37. An object is placed in front of a concave mirror of focal length 0.15m produces a virtual image which is twice the size ofthe object. What will be the position of the object with respect to the mirror?
    7 years ago by Komal choudhary
    Ans 1 ->
    -0.075
    7 years ago by Pranav Guruprasad

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  37.  
    38. A light ray incident on a plane mirror(horizontally placed).the mirror is rotated in the anticlock wise direction with 9/pi rev/sec .The light refelected is received on the wall w (vertically) at 10 cm from the axis of rotation .when the angle of incidence became 37^ find the speed of the spot (a point) on the wall
    7 years ago by nitin tomar

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  38.  
    39. A light ray incident on a plane mirror(horizontally placed).the mirror is rotated in the anticlock wise direction with 9/pi rev/sec .The light refelected is received on the wall w (vertically) at 10 cm from the axis of rotation .when the angle of incidence became 37^ find the speed of the spot (a point) on the wall
    7 years ago by nitin tomar

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  39.  
    40. A light ray incident on a plane mirror(horizontally placed).the mirror is rotated in the anticlock wise direction with 9/pi rev/sec .The light refelected is received on the wall w (vertically) at 10 cm from the axis of rotation .when the angle of incidence became 37^ find the speed of the spot (a point) on the wall
    7 years ago by nitin tomar

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  40.  
    41. A light ray incident on a plane mirror(horizontally placed).the mirror is rotated in the anticlock wise direction with 9/pi rev/sec .The light refelected is received on the wall w (vertically) at 10 cm from the axis of rotation .when the angle of incidence became 37^ find the speed of the spot (a point) on the wall
    7 years ago by nitin tomar

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  41.  
    42. an insect of negligible mass is sitting on block of mass Market tied with a spring of force constant k. the block perform shm with amplitude A in front of a plane mirror place as shown. the maximum speed of insect relative to its image will be ( the angle between the vertical spring having mass m and plane mirror is60 degree )
    7 years ago by qwerty
    Ans 1 ->
    Sorry it's not market it is m
    7 years ago by qwerty
    Ans 2 ->
    v3 v(K/m) A
    6 years ago by ayush raj
    Ans 3 ->
    v is not v it is root over
    6 years ago by ayush raj

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  42.  
    43. Sir, is it is necessary for the image to form at infinity when the distance of object is equal to focal length of the spherical mirror
    7 years ago by Anurag Dalmia
    Ans 1 ->
    No... if an object is placed at a point in front of it at a distance equal to that of focal length image will not be produced at infinity...
    7 years ago by Physics Galaxy
    Ans 2 ->
    Sir colud u pls elaborate it bcoz I couldn't understand
    7 years ago by Anurag Dalmia

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  43.  
    44. Ans 2-> angle between two normal is 180 degree. how?
    7 years ago by Ved Singh
    Ans 1 ->
    Why you are asking same query again... pl specify the time in video where you are facing the problem... in video it is not mentioned that angle between two normals is 180°...
    7 years ago by Physics Galaxy

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  44.  
    45. how does the angle between the two normals became zero?
    7 years ago by Apoorva Mishra
    Ans 1 ->
    Where it is mentioned that angle between the two normals is zero... pl watch the video carefully again and reply with the time instant concerning to your query...
    7 years ago by Physics Galaxy
    Ans 2 ->
    angle between two normal is 180 degree. how?
    7 years ago by Ved Singh

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  45.  
    46. A luminous object is placed at a distance of 30 cm from a convex lens of focal length 20cm. On the other side of the lens at what distance from the lens must a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it?
    7 years ago by Parth Singhal
    Ans 1 ->
    You can get the image at the same location of object only when the incident rays on mirror will back trace their own path i.e. normal incidence so the mirror must be placed such that the image of convex lens should either be at the center of the mirror or at the pole of the mirror...
    7 years ago by Physics Galaxy

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  46.  
    47. HOW CAN PROVE THIS IF MIRROR IS ROTATED BY AN ANGLE THETA THEN THE IMAGE WILL ROTATE WITH ANGLE 2 THETA
    7 years ago by Parth Singhal
    Ans 1 ->
    Watch this video carefully, in this video only I have explained this... final reflected ray from mirror is deviated by an angle 2T from the initial reflected ray direction...
    7 years ago by Physics Galaxy

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  47.  
    48. sir which are the reference books that are to be followed for iit mains exam as i am a 2017 aspirant only with respective physics
    7 years ago by Bineeth
    Ans 1 ->
    By July we will start a section of recommended books and online study links on Physicsgalaxy.com for all subjects... you can start following that...
    7 years ago by Physics Galaxy

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  48.  
    49. sir after first reflection image will be formed behind convex mirror.then it will be virtual object for convex mirror. can a convex mirror gives image for virtual object?????????????????????
    8 years ago by abhishek

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  49.  
    50. Sir the directions of the cross product on both the sides of the vector equation are coming opposite?So how will they be equal?
    8 years ago by Yash Selot

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  50.  
    51. How is the vector equation for the second law equal on both sides(Applying the right hand rule wont the directions of the resultant vectors be different)?
    8 years ago by Josh Pius
    Ans 1 ->
    No it will give the same direction as direction of unit vectors are taken along the direction of light...
    8 years ago by Ashish Arora

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  51.  
    52. sir the ratios of the sides u have taken in the solution is completely different from the triangles u wrote...i didn't get it..
    8 years ago by Khushboo Jain
    Ans 1 ->
    see carefully u may understand... okay..
    8 years ago by Pranay Rahul Ganji
    Ans 2 ->
    I have used what I have written, the similarity I have applied for the base and altitude of the triangles... not necessarily it is applied for the sides and angles only...
    8 years ago by Physics Galaxy

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  52.  
    53. sir could you please explain which two triangles are similar and the parameters of similarity ?
    8 years ago by Kaushik Govindharajan
    Ans 1 ->
    Triangle EAB and EA'B' Base-Altitude
    7 years ago by Irshad Ahmed Khan

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  53.  
    54. A body is dropped from a height of f/2 from the concave mirror of focal length f at t=0.Acceleration due to gravity is g.Find the time after which the speed of image becomes maximum and its magnitude
    8 years ago by Suresh kumar

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  54.  
    55. sir i want to know y u havent kept all modules in order ...is there any reason?
    8 years ago by karthik

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  55.  
    56. An eclipse of the sun by the moon covers 10% of the total area of sun. Calculate the distance between the centers of the sun and moon if we consider both of them to have the same radius.
    8 years ago by Deepesh Dey

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  56.  
    57. in metals,permitivity is infinite then according to the expression for speed of light, the speed of light in conductors must be zero. what does this imply?
    9 years ago by rachana s yajur

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  57.  
    58. Dear sir in the above diagram AC is not exactly equal to x ...is this true sir??.
    9 years ago by Abinay gangireddygari
    Ans 1 ->
    No here sir has used a different kind of similarity which we don't know i.e. base altitude type so 2x and x are altitudes
    7 years ago by Irshad Ahmed Khan

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  58.  
    59. sir in this question i did not understand how u wrote v(iz)= 2v(mz)-v(oz)? please explain.
    9 years ago by kartik sharma
    Ans 1 ->
    Velocity of image along z axis is due to the velocity of the object as well as the velocity of the image..we know that if mirror moves with velocity v then image move with 2v in same direction.and also the velocity of image is negative of the velocity of the object..since they are along z axis adding them we get the above result...
    9 years ago by Abinay gangireddygari
    Ans 2 ->
    refer to module 17 for exact answer by sir
    7 years ago by Irshad Ahmed Khan

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  59.  
    60. I DIDNOT UNDERSTAND THIS PROCESS OF GETTING THE IMAGE POSITION CAN YOU EXPLAIN ONCE AGAIN IN OTHER PROCESS SIR
    9 years ago by Pooja Madhurima
    Ans 1 ->
    In this example I am using the simple concept that object distance from a plane mirror is same as image distance from the mirror on its other side normal to mirror, rest its coordinate geometry... view the video again... you will get it..
    9 years ago by Physics Galaxy
    Ans 2 ->
    this can also be done by simple mathematical concept of straight lines.....that is.. if want to find the image of any point via a mirror of straight line having slope 1 or -1 jst u simply put the coordinates of the object in the line of the m1rror and find the corresponding coordinates of the image....this will save ur tym.... :)
    8 years ago by Khushboo Jain

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  60.  
    61. sir can u pls explain how by similarity of triangles we have arrived to h/5=3/25 i tried a lot but was unable
    9 years ago by vishal
    Ans 1 ->
    For Triangles to be similar, They should have: 1)their corresponding angles equal or 2)Corresponding sides will have same ratio. So, here, all the corresponding angles are equal. So, they are similar. After finding the similarity of these triangles, we can use the expression: h/5=3/25
    9 years ago by Sabbarish Govindarajan

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  61.  
    62. How is the cross product for second law equal in the video?
    9 years ago by Shubham Sawaikar
    Ans 1 ->
    Since the Angle of Incidence is equal to the angle of reflection, sin(theta) will be same for both. =>the cross product is correct(It's the cross product of unit vectors. So, don't care about the magnitude :))
    9 years ago by Sabbarish Govindarajan

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  62.  
    63. Can a light ray be reflected completely?I mean,no part of it will get refracted.
    9 years ago by Shubham Sawaikar
    Ans 1 ->
    yes this happens in case of total internal reflection.It is given in pg videos.
    9 years ago by himanshu chhabra
    Ans 2 ->
    No , Never as at the interface of two mediums always their is absorption , reflection & refraction of light wave . As light constitute of small energy packets called quantums or quantas . Which is explained in wave optics .
    9 years ago by Mohit Kuri
    Ans 3 ->
    Practically no. Theoretically yes. Since, there is still no object found on earth which is reflecting completely. But for simplicity, we use complete reflection.
    9 years ago by Sabbarish Govindarajan

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  63.  
    64. sir can you derive the mirror formula??..
    10 years ago by rohith vaddavalli
    Ans 1 ->
    http://www.meritnation.com/ask-answer/question/derivation-of-mirror-formula/ray-optics-and-optical-instruments/1544704 But the derivation is useless. Just remember the formula. It's easier to remember the formula than to derive it.
    9 years ago by Sabbarish Govindarajan

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