Michelson Interferometer 

Thanks for the simplicity, I spent 2 days from my time without any results in other channel but here just 2 minutes I understand the principle of interferometre

4 minte video better than 40 minute lecture of my professor

This is really helpful for someone who has never seen the michelson interferometer! Thank you very much!

very nice video! I was wondering how the "counting and calculating" works this explained it pretty well to me! Thank you!

You guys are so lucky to have an optics lab. Here in Ireland we have nothing yet. By the time they bring this knowledge to our locale I'll be kicking up the daisies. Regardless, thanks for the demonstration guys.

Wow so short, simple and to the point, great video.

Thank you sir. I am a university student but you're explaining this amazingly ,you have my respect.

Thank you so much for this demonstration!!!! This helpt me and my lab partner very much in our upcoming optics lab where we are measuring the refractive index of air!

Simply wonderful. Just splendid. keep up the super hard work

Very nice animation with easy-to-understand description and presentation

I’m a visual learner, this helped alot, thanks!

Man, you just saved my lab day! Thanks

thanks very much for this demo.

Amazing video! Really helped me learning.

Could not be better than this!!!

Thank you very much for your video .This is very educational and clear as light , of course :)

This video is great. Thank you for the upload

AHHHHH ok ok, I now see why moving the mirror 1/2 a wavelength causes the waves to cycle an entire period of interference. I didn't have a picture to look at before so I was so confused. It is so obvious with a good diagram! Thanks!

Thank you very much. Now I can make sense of light interference.

Many many thanks. It clears my confusion. Good wishes

Awesome video, thanks guys!

Really concise explanation, thanks!

Very nicely explained! Thanks a lot

Best video on this subject.

Wah bhi wah..... great...keep it up

Excelent explanation, thanks!

Beautiful effect Wave Indicates Light's Medium

Great video! thank you very much.

Excelente, muy bien ilustrado.

very well explained and educational

Outstanding video

Wouch this is just too good😍

Great explanation thanks

hat result will you have on that red and black circles (sorry don't know the name) if the light beams returned and hit the splitter without recombining in the same spot, but hitting different part on the splitter?

Is the component on the left side of the interferometer, between the laser and beamsplitter, a diffuser? Could we see the circular fringes with a collimated light beam?

Cruicial for my Waves and Optics exam! Thanks

Good explanation 👍👍👍

What's the object between the laser source and the beamsplitter?

this was excellent

thanks for this video!!!

Many thanks!

If you can can you demonstrate the same animation of light moving when the whole thing is turning?

Hello just need some help. How does changing of medium affects the changes of fringe in Michelson interferometer? Like changing the color of laser light.

amazing! thanks

Really usefull video

Can a laser beam interfere with another laser beam if they meet head on? or at an adjacent angle?

is the distance increased or decreased?

Very inspiring to young scientist

Very good

thanks for sharing.

Mashallah thank u 😍🌸🌸

Thank you Sir :)

Great video. But where does d indicate? Which distance is d?

how can I use the same apparatus and formula the find the distance?

thank you

Gostei, daí sairá meus estudos...

Apka bhut bhut dhanyavad

very useful

Please adjust d1 and d2 so the distances go through the equal point several times. Note how the fringes behave during this passage.

thanks Sir, really helpful for me

great explained ..thankss

Thanks

Great!

I tried to create this setup in the lab, but I am getting straight parallel fringes instead of circular fringes.

interferometer sounds really 19th century so futuristic oooooh

What causes the shape to be like that instead of just a dot?

think you very much for the so compeltely theory!

Thanks!

Wow! From minute 1:36 We can detect the "eather wind" on the mirror or the mirror motion respect to the medium. A change of distance make changes on interference fringes, not an hypothetical eather wind. So We don't detect earth's motion respect the médium, because there's no earth's motion. So the earth is MOTIONLESS.

There is something between the laser and the beam splitter. Why did you not identify it?

How we can recover wavelengths from different from interferogram

If the laser beam light can be split in faze and antifaze path and destroed at recombination, where is disapearing the fotons energy. Can be the conservation of energy low broken by interferometery. Please, I need a qualified explanation.

sir how to determine the thickness of the mica sheet using a michelson inferometer plz sir do reply its urgent...

Great demo but you left out the most important part - rotating the whole apparatus to demonstrate that there are no fringe shifts and hence the speed of light is constant.

Great

You may have taken for granted the knowledge that light travels in waves, because you have grown up with it. This experiment proves by observation that light does travel in waves and it is possible to measure the velocity (direction and speed) of those waves. The change in scientific thought when this experiment was first studied required many concepts that can't be observed, such as the vague and "far out" concepts of ether, waves and interference.

good

she how to determine the thickness of the kids sheet using a michelson inferometer plz sir do reply its urgent...

why are there rings? shouldn't it just be 1 laser dot that gets brighter and dimmer as it interferes with it self?

sir how to determine the thickness of the kids sheet using a michelson inferometer plz sir do reply its urgent...

hw does pattern look like that.. beams coming from both mirrors should have constant path difference for entire beam so for a perticular time interval there shall be compleate light or dark pattern

when counting the fringes, how did you know when to stop? the last 8 looked pretty much the same

That sure looks like an inch division micrometer (1:24) at .025 inches per rev. What you are calling 6.5 microns (1:58) would appear to be .0065 inches. Metric micrometers are graduated 50 divisions and 1/2 mm per rev. So either your movement of the mirror is not linear or there is some funny business going on here. Please explain the adjustable mirror setup in more detail if you can. Does the back of the case come off to see the mechanism? Regards, Tom

Something weird happens when it passes through the d1 = d2 point. The light will blackout and the micrometer movement becomes less effective in moving the fringes. His experiment does not show passing through the equal point.

I really wish Haidinger fringes were explained in this video; otherwise it is not at all obvious why do we get a circular interference pattern.

pretty cool, disappointed that it's in an MIT lab and yet there is no sound lol

But where does the energy go when photons cause destructive interference? if a coherent polarized beam is split in half and perfectly combined with it's self 180 degrees out of phase, the light would no longer be visible, so where would the energy have gone to?

thank u soooooooooooooooooo much it was very hepfu

Why have I seen this same output, with my eyes closed?

Why is the distance 1/2 wavelength? Isn't one peak to next peak suppose to be a whole wavelength??

Nice video but I don't see the middle "new" fringe you talk about

These Ideas consequently lead to the theory of relativity, because the speed of light measured on one planet was different when measured on earth, hence light is relative to the objects moving around it. Basically, before this experiment challenged common sense, science was considered to be observable. Someone correct me if I got it wrong.

Wavelenght/4

What will happen if it was moving horizontally to the surface of earth?

AWESOM DISCRIPTIVE STYLE

I think the phase will not change. Because assuming it was passing through the ether as a result the mirror is moving(relatively to ether), so the light is changing it's phase because it has to travel longer distance, but after hitting the mirror and moving towards splitter again we should concider that the splitter is also moving towards the light(entire apparatus is moving relative to ether). As a result the light will turn back to its same phaseas it was before when it hits the splitter again, because now the splitter is moving towards the light and light will travel less distance. But i think the lights will not combine in the same place on the splitter, if ether was moving...

Ich grüße meine Mitschüler aus dem Physikkurs!

i know that lamda is the wavelenght and N number of fringes . by what's D ??

Fabry Perot interferometer ka dalo n please

TSG Physics When you measure d the measurement will shrink due to relativity/Lorentz/Michelson & Morley and also distance is measured in meters and 1 meter = distance light travels in 1/speed of light seconds. How can you measure the speed of light using the speed of light?