How to Solve Thin Film Interference Problems in Physics
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- เผยแพร่เมื่อ 1 พ.ค. 2023
- An explanation of thin film interference, constructive interference, destructive interference, and index of refraction, and then some practice problems.
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Ive been stuck for literally hours, your video cleared it up in 30 min. Thank you!
Happy to help! Thanks for watching!
I have watched like a dozen videos on thin film interference and this is by far the best one. Builds such a good foundation on the subject, i somehow got all my homework after this
Wow, thanks for the compliment! Where's the award for "Best video on Thin Film Interference"?
Watching this 2 hours before the AP Phys 2 exam, this helped so much!
Good luck!
😀I join Matt-Holdren's comment. I've been stuck trying to solve one exercise for hours, but thanks to your video I was finally able to solve it. The formula and solution method you showed are very clear and easy to remember. I am wondering why it's not explained so clearly in my physics book... Thank you very much!!!
Thankyou so much sir!!. Best video for film interference
Thanks! Happy to help!
Thank god I found this in time man...my head was spinning as to why we were switching the formula of constructive and destructive this whole time... Thanks a lot!
Believe me, I wish I knew this sooner too, haha
Thank you so much Dan. You've saved my life.
No problem! Next time, you can save my life.
What a brilliant and straight forward explanation, you're saving lives !
I’m not a doctor. I’m just your normal everyday supertutor.
this was so helpful, thank you so much! I have my physics midterm in a couple hours
Simple and beautiful explanation!
best video out there on thin film interference. period. thank you a trillion
Thanks for the stellar review!
i finally understand now !!! thank you!
Thank you!
great video thanks for the help!
absolute guy for this
thanksss i understood it very well !!
Best tutorr everrr.. i dua you all the best hocamm
Thanks! Appreciate it
Great explanation, thank you I finally understand this now lol
the best love this
Best teaching
thanks sir, good vid
Glad you enjoyed!
legend!
Thank u, u saved my life before finals
No prob. Now go crush that exam!
perfect teacher and better then our school teacher
Really setting a low bar there… haha thanks!
brilliant
Dan the tutor❤️
Why is it that when you go from high to low n there isn't a phase shift? 3:35
niceeee
Ur the best
Correct
2:25 Could you please inform me why we need the smallest value possible and when will we use the greater values?
Good question. Usually, the question has some wording like "minimum thickness", and that means that you use the smallest value for m. You'll notice that my questions did not say that, so technically you can use the larger values for this video.
The only time you NEED the larger values is when the question says something like "what are the first 3 thicknesses that will work?" In that case, you'd use the first 3 values for m (for instance m = 1, 2, 3)
@@danthetutor2624 But why do we need the greater values in the second scenario; I don't have an intuitive feeling for it. Besides, I don't walk with you in the notion of "you can technically use it". What do you exactly mean by this? Will I get the same results even if I use larger values?
It's because there are infinitely many answers to the thickness question, depending on what value you use for m. So for instance the answer could be 1 meter thick, 2 meters thick, 3 meters thick, etc. That's why most problems will say "minimum thickness".
I say "technically" because I meant to put in the word "minimum thickness" but I forgot. So any value of m would work. But most problems will not forget to say that.
Wouldn’t you have to change your wavelength to the wavelength in the film?
I see what you're saying. I think that makes logical sense, but every physics problem I've ever seen doesn't do that. So I'm inclined to say "no, don't change the wavelength" but I don't have a good reason why.
There's a point I don't really get it. How can I know there is actually 1 lambda in 2t? if light is blocked out, there's probably 2 lambda in 2t, therefore the answer of thickness might be tow times of yours
Which problem are you talking about?
@@danthetutor2624 thin film interference thickness measurement
Most other videos the wavelength in the formula is taken as the wavelength of the film ,, why you take it as the wavelength of the light???
I was bouta ask the same question
@ Dan the tutor
@hussienbast2342 collegeboard says to use wavelength of film so I’d just do thT
For us non physics people, what exactly is a phase shift?
Let me bestow some knowledge to you: light moves like a wave. Just like a sin or cos wave from math class. And so when we say there’s a phase shift, we’re talking about moving the sin graph by exactly half a period (half a cycle). It doesn’t matter if you move the graph left or right because it’s symmetric and it will look the same no matter what.
Thank you much!
save my life
that's what I do
mwa 💋
He didnt explain anything
He explained everything lol