Simple double slit experiment at home

This is the most simple double slit experiment that you can easily do at home with materials most people would already have.
The experiment shows that light can travel as a wave due to the interference pattern shown after a concentrated beam of light passes through a narrow double slit.

[muhammadhaashir]

It is not double slot experiment but diffraction experiment, double slit experiment uses one photon at a time.

[RevarBB]

How do u cut two slits so close on paper? It just tears apart (the paper between slits)

[tcftyrannosapiensbonsai]

Thank You! As an infographist I had to illustrate the doubleslitsexperiment a few times. Someday I realzed, that I the sources for my graphics actually were existing infographics. Those showed no actual sizes of the experiments.

[stephenclemente]

Can you explain how you cut the slits into the index card?

[karlmcaidey]

They say when light is observed, it becomes two lines!! But i see here a million lines

[vidya]

The video recorder and the light source are using the same electricity power source probably.

Thus the light source and recorder are sharing a same informationcommunication channel (the electricity source).

Try to use a charged battery powered recorder, this cuts off the information communication channel between the light source and video recorder.

Better still, if the light source are also using its own charged self powered different battery source.

[JanSzedlak]

Ehm, this is NOT what a real double slit experiment is. Its just a light refraction. Shame on you.

[paulpaulsen]

My first double slit experiment was, when my girlfriend invited another lady to our home...

[balajee]

The perfect YDSE illustrated by you....and best on YouTube.you succeeded in obtaining the fringes and their intensities were also
Next time make a video on ydse with white light and obtain coloured fringes.
Best wishes from India.

[Vintage_AE]

Good job sir that makes me more clear ❤️

[rvrnt]

Okay. How do we prove it’s a particle this simply?

[adin_musa]

From where you purchased this laser
Please put the link in description

[infooverpower]

wait isnt it single slit one?in my class we have not done this far but i know only the double slit one but this ones observations seem to be same though.anyways thanks

[Zed-ouzu]

Can we do this setup But instead of normal YDSE we do the one where the results was different based on if the experiment was observed or measered. Causing The interference pattern to not be present.

[chymarsowell]

Why does it only show the multiple lines?

[OnatGG]

So if someone looks at the paper while you are looking at the wall this pattern will be gone?

[StuartBermingham]

How do you have a wave without a medium 😭

[obiwanduglobi]

What you are showing to us are light defractions. In a real double slit experiment, the width of the slits must be very, very small (not much greater than the wavelenght of the light itself). The wavelenght of green light is about 0.0005 millimeters. To produce such thin slits, you will need special equipment.
(I did your experiment myself years ago at home in a similar way and was quite disappointed to learn that my observations were just light defractions.)

[paisaac]

So the light wave behaves as a wave? Isnt that just common sense? Its in the name

[Kallaste.]

Really, most people would already have laser of that size just sitting around? Maybe it would be helpful if you would say exactly what kind of laser it is (or link it).