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

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  1.  
    2. the bi prism in figure is placed icorrectly
    9 months ago by

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  2.  
    3. the bi prism in figure is placed icorrectly
    9 months ago by

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  3.  
    4. Why is D = a b - |v|? It is evident from the diagram that |v| D = b, thus D = b - |v|. Where did the 'a' come from?
    2 years ago by

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  4.  
    5. Sir isn't Imax only = 4Inot then how can we get a value greater than that
    3 years ago by

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  5.  
    6. sir why in 2nd ray u add lamda/2 please explain me ?
    3 years ago by

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  6.  
    7. Sir aren't all bright fringes supposed to have same brightness in YDSE any setup?
    4 years ago by Divy Sisodia

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  7.  
    8. Sir can you please confirm if the number of minima between zero and infinity are 1095?
    4 years ago by Divy Sisodia

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  8.  
    9. Is the wavelength of the superposed wave also different form the wavelength of the waves of the source?
    4 years ago by Divy Sisodia

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  9.  
    10. Why are these circular disturbances not present on the the other side of the point( opposite to the direction of the propagation of wave ) ? Why are we considering the secondary wavelet as a semicircle ?
    4 years ago by Divy Sisodia

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  10.  
    11. sir will the interference pattern continues upto infinity if screen in infinitely long?
    4 years ago by R GOPI

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  11.  
    12. sir do we get any interference pattern if suppose one aperture is slit(cylindrical w/f) and other is a small hole(spherical w/f)?
    5 years ago by Debjeet Brahma

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  12.  
    13. sir both glass and soap have same RI so why have you taken soap to be rearer?
    5 years ago by Hardik Jadwani

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  13.  
    14. Sir why is it that violet light undergoes destructive interference and not red light although both have a path difference of lambda/2
    5 years ago by Ishan Agarwal

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  14.  
    15. hello sir is lloyd mirror a part of jee mains syllabus
    5 years ago by undefined

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  15.  
    16. Or this is not in jee/board syllabus
    5 years ago by Ashish Kumar Yadav

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  16.  
    17. Sir where can I found the topic scattering of light
    5 years ago by Ashish Kumar Yadav

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  17.  
    18. The maximum number of possible interference Maxima for slot separation equal to twice the wavelength in Young's double slit experiment is
    5 years ago by Govind Rathi

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  18.  
    19. Respected Sir, is newton rings included in the syllabus of jee. If yes , is there a video on it?
    6 years ago by Siddhesh Sundar

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  19.  
    20. Sir Central fringe in your diagram in case of cylindrical cross section is bright why? U are saying it should be dark in the video
    6 years ago by Koustubh Sharma
    Ans 1 ->
    It should be dark(He said correctly,but diagram is wrong)
    6 years ago by Akshunn Trivedi
    Ans 2 ->
    at centre path differenece become zero ..so there should be a bright fringe ..is it correct??
    5 years ago by MUHAMMAD SALEM KOTTUPANTHARA
    Ans 3 ->
    Sorry..i havegot...at. centre, path difference will be lambda/2 so.. centre fringe will be appears as bright
    5 years ago by MUHAMMAD SALEM KOTTUPANTHARA

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  20.  
    21. why is additional path difference added to it ?
    6 years ago by Pratyush Ranjan Roul

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  21.  
    22. Sir, the animations are really good !!
    6 years ago by Pratyush Ranjan Roul

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  22.  
    23. sir but if there is a phase difference how is it possible that all the bright fringes will have an intensity of 4 I?
    6 years ago by ABHISHEK SHANKAR
    Ans 1 ->
    oh sorry got it...
    6 years ago by ABHISHEK SHANKAR

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  23.  
    24. Path difference = 2 * (meu) *t ? How is that possible?
    6 years ago by Rupesh Koirala

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  24.  
    25. sir why would there not be any path difference because of reflection in first wedge?.. it is getting reflected after all....
    6 years ago by shrijeet shivdekar
    Ans 1 ->
    because it is getting reflected at denser -rearer medium interface and so no path is added if it was the reverse case the path difference of lamda/2 would have been added
    6 years ago by shvank rastogi

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  25.  
    26. sir where would central bright fringe be obtained??
    6 years ago by shrijeet shivdekar

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  26.  
    27. when we keep the transparent material on slit 1 how come the light from slit 2 also refract.
    7 years ago by hulk iron
    Ans 1 ->
    the same light ray will move. the difference is that the 1st constructive interference(maxima) (with highest inttensity) will take place at a point above O .
    6 years ago by Pratyush Ranjan Roul

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  27.  
    28. Sir how are we getting interference patterns on the line? I know about YDSE which is on a screen.But here the distance D varies.So does that mean interfernce patterns are produced in the entire 3D space and YDSE is just a special case? Sir Please Reply
    8 years ago by Karan Singh
    Ans 1 ->
    Interference is produced everywhere.... consider the wave nature of light... The thing is that a screen helps us notice the patterns.. The detector in this case might have an internal screen which helps it in counting the maximas..
    7 years ago by Ratnajadit

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  28.  
    29. sir how do you know that in 21.3 there is bright fringe and in 21.8 there is dark sir please help me out......
    8 years ago by Aryan Malguri
    Ans 1 ->
    within half wavelength path difference of a point at which path difference is integral multiple of lambda (like p.d. = 21 lambda) there is a bright fringe due to constructive interference and similarly near to a point of path diff which is odd multiple of half lambda (like p.d. = 21.5 lambda) there is a dark fringe...
    8 years ago by Physics Galaxy

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  29.  
    30. Sir, if a thin transparent fil is placed in front of both the slits of ydse, how to find the shift in position of fringes?
    8 years ago by Chenna Keshava B S
    Ans 1 ->
    Dude... there won't be any shift... Remember what sir said... shift is produced if there is a difference in path travelled... In this case... light will travel same distance from both the slits.. hence central maxima will not move
    7 years ago by Ratnajadit

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  30.  
    31. Please explain how (delta x)/d =sin(theta).i.e. how angle Q S2 S1=theta
    8 years ago by Bhaskar Gope
    Ans 1 ->
    same doubt .......
    6 years ago by Pratyush Ranjan Roul

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  31.  
    32. The path difference will keep on changing as detector moves along x-axis. How can we directly use formula? Thanking you Regards Daattavya Aggarwal
    8 years ago by Daattavya Aggarwal
    Ans 1 ->
    Sir how are we getting interference patterns on the line? I know about YDSE which is on a screen.But here the distance D varies.So does that mean interfernce patterns are produced in the entire 3D space and YDSE is just a special case? Sir Please Reply
    8 years ago by Karan Singh
    Ans 2 ->
    The path difference changes... u are right And here Sir has considered the difference.... As at zero and infinity we got those values.. the other values must be intermediate to these.. He has simplified the process... how many will u sit and count?
    7 years ago by Ratnajadit

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  32.  
    33. Displacement Current
    8 years ago by Anik
    Ans 1 ->
    what?
    5 years ago by Samay Sagar

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  33.  
    34. Sir, shouldn't D = b - mod(v) instead of a + b - mod(v)
    9 years ago by Kartik Choudhary
    Ans 1 ->
    yes you are right it is a mistake...
    8 years ago by Aryan Malguri

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  34.  
    35. for first reflection we took additional path lag of (lambda/2) for path difference. similarly when second reflection occurs inside the thin film, shouldn't there be an additional path lag of (lambda'/2) for extra path difference where (lambda' is the wavelength of light in film)?
    9 years ago by Naveen Nallusamy
    Ans 1 ->
    No, because path lag occurs only when light in rarer medium is reflected from denser medium.
    9 years ago by Kartik Choudhary
    Ans 2 ->
    when it is travelling from rarer to denser phase change of pi occurs so lambda/2 path difference whe it is travelling from denser to rarer no phase change occurs if u still dont understand watch https://www.youtube.com/watch?v=HhY4A0LsF_s&list=PL3Wi397dlS-H8yjZEN3ocuPdOnHmNKuAA&index=16
    9 years ago by akanksh
    Ans 3 ->
    It's a paid video. If you have problem understanding the concept(of the path difference one) then search phase difference due to reflection of wave and read the physics stack exchange article,it is really helpful
    6 years ago by Akshunn Trivedi

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  35.  
    36. U wrote that I=K(A1^2+A2^2+2kA1A2cosx)...........(x=phi) But in the next line, u wrote that I=kA1^2+kA2^2+2kA1A2cosx Whats the correct one since both are different...
    9 years ago by Sabbarish Govindarajan
    Ans 1 ->
    It's just a mistake in writing.actually there is no 'k' inside the bracket in the first term u have mentioned.
    8 years ago by L.m.rama krishna

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  36.  
    37. How to find the distance between the central maxima when a light consists of two wavelength in YDSE
    9 years ago by Sudharsan P
    Ans 1 ->
    In YDSE always central maxima of all wavelengths is obtained at same point and in case of multiple wavelengths central maxima will have max intensity near centre of screen... as here all wavelengths interfere constructively as path difference is zero...
    9 years ago by Physics Galaxy

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  37.  
    38. In Optics light is considered as a wave, so can we define angle for the wave?
    10 years ago by saurabh
    Ans 1 ->
    Dude... If by angle of wave you mean the phase then... this wave is basically the E vector (light vector) ... so in general optical phenomena, phase of light will be phase of E
    7 years ago by Ratnajadit

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