How Interference fringes are produced in WEDGE SHAPED film with Animation & derivation, 👌, Physics

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Thank you for your support! How interference occurs in thin wedge shaped film. This is what is explained in this video. Watch complete video to understand the concept.
Tip: If you find this topic difficult watch this video 4-5 times in a period of 2 weeks and you will find your understanding of this concept has raised much.
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What is wedge shaped film, how interference occurs in the film and brightness and darkness conditions are shown qualitatively(Main points)
Physics. Engineering physics. Optics. Interfere. Newton's ring. Spacer. Light Interference. Interference Fringe pattern. Equidistant fringes, bright and dark fringes. Straight fringes, Fringe width, edge of the wedge, wedge angle. Path difference, equivalent optical path, stock's law of reflection, brightness darkness conditions, constructive destructive Interference. light optics physics, produce thin air film, glass plate interference, path phase change on reflection, circular fringes, varying thickness film, diffraction, interference and diffraction, soap bubble, non uniform oil film.
Interferentie in Wedge-vormige (Niet-uniforme dikte) film.
楔形（不均匀厚度）膜的干扰.
くさび形（不均一な厚さ）フィルムの干渉.
Interferencia en forma de cuña (espesor no uniforme).
Интерференция в клиновидной (неравномерной толщине) пленке Please consider supporting me at www.Patreon.com/santoshsasane. Please consider supporting me at www.Patreon.com/santoshsasane. JEE, NEET, CET, IIT, Preparation, Physics, JEE Physics, NEET Physics, CET Physics, JEE advanced, IIT Entrance Test, Medical entrance

[@sahilwaghmode7699]

a good way to teach ...but I think you should keep background music volume low. so your voice will become more clear. besides that thank you

[@bhavyasreeyarramareddy329]

Sir ur teaching was just awesome the only problem is the back ground music..so I wish in ur next video it will be solved

[@ce018dushyantkumar6]

Sir your English speaking method is so awesome

[@PriyaSingh-hs5qd]

Sir, my practical is : To determine the angle of a given small wedge using the " Double Spot" technique. Sir , may you upload a video for this practical

[@nishanpaudel5876]

7 : 50 onwards my confusion still remains please help. The reflected light from upper surface of wedge faces path change of lambda/2 but why doesn't it change for the reflected light from the lower surface of the wedge glass and cancel each other out. In figure why doesn't the light reflecting from R undergo go path change of lambda/2?

[@ayushdudhani]

I'm not 100% sure... But in upper side there is phase change of pi due to reflection at denser medium which enters rarer medium.. And in lower side we have taken again air means under that wedge again air is there... So reflection at air (rarer medium) And then it reflected to denser medium (glass) So there is no phase change.. Phase change pi when light ray reflects from denser medium and moves into rarer Phase change is 0 when light ray reflects from rarer medium and moves into denser medium OR there is no change in medium CORRECT ME IF I AM WRONG ANYWHERE🙏

[@nishanpaudel5876]

@@ayushdudhani but there is air between glass plates right? So shouldn't it be same for both cases (air to glass)?

[@JitendraSingh-ok2wt]

i am highly thankful to you sir, i have seen many videos and nearly no one replies to the query asked in the comment box but sir you are just great both as a person and a teacher ! again thank you very very very..... much sir !!!!!

[@SSPhysics]

Thanks Jitendra for your appreciation.

[@유투브자제운동]

I'm using airpod and I hear your voice and background music separately. Voice on the left side and background music in the right side. Am I the only one who hears like this?

[@akshatbakliwal1319]

Nope

[@varun_4125]

yeah, me too

[@ponnusmehendidesigns1631]

Very useful 👍👍

[@Democratic_people]

Well explained

[@arjundevchoudhary2585]

This result supports only when the refractive index of wedge plate is ú , and surrounding is air.. I think if we consider air plate and surrounding as ú, then the formula will be.... 2tcos(r+©)/ú.??

[@dewanshsharma242]

Very nice explanation thank you sir

[@pankajsarkar2416]

Your video is beautiful it helps me lot

[@manoharkarneedi4531]

Can u explain proof for delta?

[@subhamdas6699]

thank u sir...it was a very nice video

[@potlasony5960]

Thanks for fast reply

[@yogeshchede8745]

Great..Sir will you make more videos.

[@virendraindian5775]

Nice explanation bro

[@chaitanyayadav8600]

Sir, my doubt is as the two rays after ST line are not parallel how can u say they travel same distance after ST?

[@SSPhysics]

Yes. Your doubt is right. Though they are unparallel, when a person sees, the rays get converged by eye 's lens and arrive at a point on retina. Effective distance traveled by the two rays is same and that can be proved.

[@Shreejaya]

Can you explain why the only depends on shape of upper surface only...not lower? .... because this concept is used in Newton's ring & for both reflected and transmitted Rays the shape is rings..only conditions are changed for bright and dark rings.

[@SSPhysics]

Because bottom surface is flat and horizontal. But top surface is ascending.

[@Shreejaya]

@@SSPhysics ok thank you so much,that's mean it only depends on the the surface whose thickness is changing,not const .& I've one more doubt...is central Max is formed in case of thin film interference or not? The fringes are formed within the film in case of thin film....so what is the shape of the fringe?..

[@SSPhysics]

@@Shreejaya No central Maximum in case of thin films. Shape of fringe totally depends on 3D structure of thin film. In case of newton's rings top surface of air film is spherical in shape. So fringes are circular.

[@Shreejaya]

@@SSPhysics okay but i am talking about the parallel thin film interference ...are the fringes are straight ? And how the refracted light interference is observed in microscope / telescope...as the refraction occur at lower surface & in microscope we are only observing reflected rays from top surface...and is interference between refracted & refracted light occurs at a time?

[@SSPhysics]

@@Shreejaya Fringes are observed only in NON PARALLEL OR NON UNIFORM THICK film. No fringes in thin parallel film. You can observe fringes in refracted system provides light falls on film from downside. Both refracted and reflected fringes occur simultaneously.

[@ajinkyashete9099]

Great sir .............plz plz plz sir upload more videos

[@SSPhysics]

Thanks for your comment. I am working on it.

[@ahmedkhamayseh1163]

I think it's a good topic, but I couldn't hear it because the music is too much loud.

[@vikashchauhan9091]

Good explanation .. keep doing helps lot... Thanku

[@priyatomar3930]

Good👍

[@potlasony5960]

How would dust and oil on the glass platesaffect the results

[@SSPhysics]

On which glass plate? Above (top) glass plate or below glass plate?,

[@potlasony5960]

Both glass plates

[@potlasony5960]

Sir, I have another doubt

[@potlasony5960]

What percentage errorwould results from miscountingthe bars by one

[@SSPhysics]

Dust particles will make image/ pattern unclear. If air film between two glass plates is replaced by oil, you will see compressed pattern (close fringes) because refractive index is increased.

[@amrmahmoud7231]

Thank you for the video It is really helpful and awesome I just have a question, why did you say that the wedge angle should be very small? I believe that even if theta is large but satisfies the brightness condition, I will get the interference pattern. What do you think sir please?

[@SSPhysics]

Interference is observed only in thin films and not in thick films. If angle is large, film thickness is large and film will not show Interference.

[@inyshel3715]

Why do we have to consider u(mue) if there was air inside???? I

[@somebuddy8104]

May god bless you sir.

[@hemenchamuah2244]

sir plzz transmitted light ke liye v kr dijiye..plzzz sir

[@stutijani4474]

Sir why is the path difference same after points T and S?

[@SSPhysics]

+Stuti Jani When these rays get converged by a biconvex lens, they meet at a point and they travel equal path after T and S till the meeting point.

[@stutijani4474]

SS Physics thank you so much sir😊

[@Gebev]

What is small t?

[@SSPhysics]

Thickness of film where light get incident.

[@Gebev]

@@SSPhysics Thank you for the prompt reply!

[@shivangisoni2281]

Very helpful...

[@shivanivhatkar761]

Sir can you please upload a video for cases of double refraction of crystal cut for polarization chapter?

[@SSPhysics]

+Shivani Vhatkar Sure Shivani.

[@shivanshusahu6121]

Thank you Soo much sir

[@raobhatotia3089]

'n' is not natural number...n is whole number because natural no. Start from 1

[@BaljeetSingh-qq8pw]

Thanks sir

[@himanshusharma1220]

Sir what happens if we increase the shape of space ?

[@SSPhysics]

If we increase size of spacer, wedge angle θ will increase and β that is fringe width will decrease.

[@himanshusharma1220]

can we see wedged shaped film interference if we don't have telescope?

[@SSPhysics]

@@himanshusharma1220 it depends on wedge angle. Microscope Not Telescope.

[@himanshusharma1220]

@@SSPhysics sir I have a question in which it has given telescope so I am confuced

[@pankajsarkar2416]

I want a class on series and parelal LCR circuit

[@umasree4330]

awesome sir

[@srdjanviskovic]

Can you tell me why is there a dark fringe in the spot where two plates are touching? Thank you! I seem to struggle to understand the Indian English accent (sorry). :)

[@SSPhysics]

At that location thickness of air film is 0, means only glass throughout, so there is no air film for reflection. Technically, Path difference for wedge shape film=2mu t cos(r+thita)+lambda/2 For normal incidence r=0, thita practically near to zero, for air film mu =1. Therefore P.D. = lambda/ 2 only which is condition for destructive interference that is darkness.

[@JitendraSingh-ok2wt]

respected sir, why interference will not take place in thick film

[@SSPhysics]

+Jitendra Singh For good interference, sources( interfering rays) must be close to each other. But in case of thick film reflected rays are not close to each other.

[@lavanyag2246]

If thin spacer is placed parallel to the glass plates what will happen

[@SSPhysics]

Only direction of wedge and hence direction of fringes will change through 90°.

[@lavanyag2246]

@@SSPhysics then can we find the thickness of that object

[@SSPhysics]

Yes. from wedge angle thita and distance of spacer from edge of wedge.

[@SSPhysics]

Using tan relation.

[@lavanyag2246]

As we placed thin spacer parallel to the glass plates,then angle will be zero degrees?

[@pragyaagarpalod1187]

I was rather looking for discussion about localization of fringes in wedge shaped film

[@thepikachu143]

Bgm is dominating

[@Rahul-bq6xl]

Gr8 video but the music in background was kind of disturbing me. Maybe the music is too loud.

[@husainmurabbi1606]

SImple and Awsome!!

[@HarshPatel-iy5qe]

Illuminate

[@abhidas5128]

How r+theta forms

[@SSPhysics]

Go to time 3.30 and do addition substraction of different angles of triangles.

[@vikramanramakrishnan1505]

Ok.. We can find the bandwidth..... Then how it is linked with the tickness of the material...

[@anantz7981]

sir hindi me samajne me kafi asani hogi jab ki English me thoda sa complicated lagata hain. agar English me samaj ata to KZbin se video dekhkar samjne ki zarurat nahi padhti it's good video but it became extremely good if it is in hindi

[@SSPhysics]

Ok vikas. i will try.

[@SSPhysics]

Hope this concept is now clear in mind.

[@mabu1652]

You say a path difference is occured at point Q ,but here you are wrong , path difference is occured by not at Q but at R , where the Ray is reflected by denser medium ,here this is glass .

[@sahilkothekar9927]

Lower the background music volume

[@mouazchowdhury269]

the background music was way too much loud!

[@helloworld12321]

Music is so loud

[@SSPhysics]

Yes it was my first video.

[@narasimharao2460]

sir please don't add background music in videos

[@harigovindek7867]

Back ground music is high... so it become difficult to understand

[@SSPhysics]

This was my first video

[@harigovindek7867]

@@SSPhysics ok😊

[@manishsolanki6765]

Mest

[@saibalaka6434]

There is no derivation part

[@AnandNM-cn3sp]

Background sound distrub all lecture 🙄

[@santhoshikumar2320]

Background music😥

[@omarhilal4194]

remove background song plzz it disturbs lossing concentration

[@therealscience210]

music is unnecessary.

[@SSPhysics]

This was my first video. No music for later videos. :)

[@adityashrimal821]

Have you made this vedio to teach students or to show the adds... Dont give more adds in between lecture its irritating... And background sound was too high...work on it and explanation was quit good!

[@pranav5787]

Background music is annoying!!

[@arslaanshaikh2049]

Please remove background music it's really annoying

[@dipink7142]

ruined the explanation with the music

[@diw9498]

Noisy

[@shankaraditya1786]

Its not pilm,its film...!!

[@SSPhysics]

Subtitles are computer generated.