Diffraction and Huygens's Principle - IB Physics

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Andy Masley's IB Physics Lectures

Andy Masley's IB Physics Lectures

Күн бұрын

Пікірлер: 31
@user-hp6ls8qy6d
@user-hp6ls8qy6d 8 ай бұрын
Thanks for a very good explanation, particularly why the waves cancel out forming another parallel wavefront.
@FreshBeatles
@FreshBeatles 4 жыл бұрын
i heard my brain click. thank you, so glad to have found this gem.
@LokeshKumar-cf7pb
@LokeshKumar-cf7pb 3 жыл бұрын
Today is my Physics exam and this the best ever video I found for revision ❤️
@louishollick8904
@louishollick8904 4 жыл бұрын
Thanks for this, you explained it very well!
@andygray9819
@andygray9819 4 жыл бұрын
So do I after 50 years of wondering exactly why
@_a_las_ka
@_a_las_ka 3 жыл бұрын
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 !!!!!!!!!!!!!!!!!
@sno3b4ll
@sno3b4ll 11 ай бұрын
Thanks from Germany!
@williamlee4626
@williamlee4626 Ай бұрын
Great Video!
@Flowint
@Flowint 3 жыл бұрын
Thank you so much! I understand it now.
@ankitaaarya
@ankitaaarya 3 жыл бұрын
You're awesome 👌 👏 , awesome teacher.
@jannatulferdows5697
@jannatulferdows5697 4 жыл бұрын
i finally get it now !
@meh3080
@meh3080 4 жыл бұрын
Hi. Can this explain why when slit length>wavelength, the diffraction is much smaller (,slit length, the diffraction is much more significant?
@rakibrafi3491
@rakibrafi3491 Жыл бұрын
thank you so much !!!!
@strugsi
@strugsi 2 жыл бұрын
Thx man. You helped me a lot!
@tcy101
@tcy101 4 жыл бұрын
4:22 shouldn't the new wavefront be slightly curved, not curved all the way back to the obstacle?
@tcy101
@tcy101 4 жыл бұрын
@@AndyMasley Oh! that is because the obstacle is in the way. Thanks!
@terryfu6219
@terryfu6219 4 жыл бұрын
If each point on a wavefront can create another circular wave would we see a single disturbance create multiple waves?
@terryfu6219
@terryfu6219 4 жыл бұрын
@@AndyMasley usually though a single disturbance only creates one wave so I’m confused on how a wave can create another wave?
@connorhowe9786
@connorhowe9786 2 жыл бұрын
thank you brother
@miles8738
@miles8738 3 жыл бұрын
Awesome explanation my man
@MrJking1962
@MrJking1962 3 жыл бұрын
You went from a spherical wave to a semi-spherical wave without explanation...
@MrJking1962
@MrJking1962 3 жыл бұрын
@@AndyMasley 1:03
@MrJking1962
@MrJking1962 3 жыл бұрын
“In all directions” includes the whole circle. A semi center of disturbance. Radiates in all directions except backwards.
@MrJking1962
@MrJking1962 3 жыл бұрын
@@AndyMasley wouldn’t that mean that light travels backwards?
@MrJking1962
@MrJking1962 3 жыл бұрын
@@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?"
@fierybl4de400
@fierybl4de400 Жыл бұрын
@@MrJking1962 damn bro you cooked
@kellyjin2469
@kellyjin2469 2 жыл бұрын
4:32 why did you connect the curve with the straight line where they overlap?
@Mozzie7920
@Mozzie7920 3 жыл бұрын
Why doesn’t the wavefront at 4:29 carry on around the waves at the top?
@AndyMasley
@AndyMasley 3 жыл бұрын
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.
@theimmux3034
@theimmux3034 3 жыл бұрын
Click on this video if your textbook isn't enough.
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