Double slit experiment doesn't work

itaybrodsky

I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side.
Thank you

mathman

http://en.wikipedia.org/wiki/Double-slit_experiment

It depends on the width of the slits and the separation.

jtbell

It's difficult to demonstrate two-slit interference with ordinary light sources because they're incoherent and emit a mixture of wavelengths. Have you tried a laser? A cheap laser-pointer should do the job OK.

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itaybrodsky	Double slit experiment doesn't work I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side. Thank you

mathman Recognitions: Science Advisor	http://en.wikipedia.org/wiki/Double-slit_experiment It depends on the width of the slits and the separation.

jtbell Mentor	It's difficult to demonstrate two-slit interference with ordinary light sources because they're incoherent and emit a mixture of wavelengths. Have you tried a laser? A cheap laser-pointer should do the job OK.