Diffraction and Huygens's Principle - IB Physics
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- Опубликовано: 7 фев 2025
- NOTE: It's pronounced "Hi-gens" with a hard g. Don't embarrass yourself like I did!!!
I go over Huygen's Principle of Waves and how it's used to predict the shape of waves moving around barriers.
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I do a gimmicky demo of Huygens's Principle in Minecraft here: • Diffraction & Huygens'...
0:00 Intro to Huygen's Principle
0:22 What is a Center of Disturbance?
0:58 Visualizing the Principle
2:07 Summary of the Principle
2:27 Definition of Diffraction
3:45 Examples of Diffraction
5:20 Double Slit Diffraction Pattern
i heard my brain click. thank you, so glad to have found this gem.
Today is my Physics exam and this the best ever video I found for revision ❤️
Thanks for this, you explained it very well!
So do I after 50 years of wondering exactly why
an AWESOME video !!! I hoped this was on top when I searched for this. Very well explained, the theory with the experiment. Thanks a lot !!!!!!!!!!!!!!!!!
Thanks from Germany!
Thank you so much! I understand it now.
Thx man. You helped me a lot!
Great Video!
You're awesome 👌 👏 , awesome teacher.
thank you so much !!!!
i finally get it now !
Dude you're a goat
Dear sir .When u drew the new plane wavefronts ,u did not draw the ends curve but while passing through a slit ,u drew the ends curved .
Why is it so ?I dont understand this point only .😢
Awesome explanation my man
Hi. Can this explain why when slit length>wavelength, the diffraction is much smaller (,slit length, the diffraction is much more significant?
thank you brother
4:22 shouldn't the new wavefront be slightly curved, not curved all the way back to the obstacle?
@@AndyMasley Oh! that is because the obstacle is in the way. Thanks!
If each point on a wavefront can create another circular wave would we see a single disturbance create multiple waves?
@@AndyMasley usually though a single disturbance only creates one wave so I’m confused on how a wave can create another wave?
You went from a spherical wave to a semi-spherical wave without explanation...
@@AndyMasley 1:03
“In all directions” includes the whole circle. A semi center of disturbance. Radiates in all directions except backwards.
@@AndyMasley wouldn’t that mean that light travels backwards?
@@AndyMasley This is actually a flaw in Huygen's Principle. It ignores, just as you did that if every point is a light source in all directions then it must also go backwards. Nature tells us it doesn't. In 1991 David Miller at Stanford mathematically showed that if every point was a "dipole" rather than a monopole light source then there will be no backward light. This is sort of like Plank solving the Ultraviolet Catastrophe with discrete mathematics but not knowing the why of the discrete nature of Quantum Mechanics. I don't know if his solution stands up in the Physics world that is that photons are dipole.
ee.stanford.edu/~dabm/146.html
You will probably never draw that semicircle again without considering this. The dipole explanation is a bit daunting but any observant student is bound to say "hey you just drew a circle and said 'every direction'. Does that mean light goes backwards?"
@@MrJking1962 damn bro you cooked
is this HL?
4:32 why did you connect the curve with the straight line where they overlap?
Why doesn’t the wavefront at 4:29 carry on around the waves at the top?
I imagined there may be more wavefront above it that I didn't include that would cause it to continue in a straight line, but if that's not there it would carry on around the waves. It wasn't the main point of the demo so I ignored it.
Click on this video if your textbook isn't enough.