Guy does this cool effect at home..

And he used a CD.  Wait a what?  Yes, Styropyro finds a compact disk, something we used to listen to music with and even download software.  Well I guess they are still good for experiments!  In one line basically here is what he is demonstrating:

How to determine the wavelength (nm) of your laser using a CD!!

He has done some cool laser videos and this is yet another one to watch!

Let’s check out how he diffracts and measures a laser in the video on page 2

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