optical illusions

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I might be wrong but I think those are polarized filters, a physics teacher showed us something like that in class once, they were very simple though each blocked 50% of the light so we could see through, but when he put them over each other, no difference in opacity was noticeable at a certain angle but if he rotated one by 90 degree it became completly dark and we couldnt see through at all anymore.

http://en.wikipedia.org/wiki/Polarizing_filter

cool stuff
 
Hm if it was polarisation it should be depending on rotation i think. My bet would be on optical grid and therefor diffraction.
 
''which one is was your favorite?''

nice english :rofl:
 
Nice ones :)

What you see is closely related to moiré fringes. look here

There are various applications for it. You can see them in real life often if you know where to look for it. In my work we use this effect to very accurately measure displacements using light. It is a bit more complicated, but effectively the same principle. It is used a lot in precision movement equipment, like CNC machines and for chip manufacture. It is in its application a very simple non-contact way of measuring very accurately differentical displacements. Since it is so accurate (and non-contact) you can also use it to measure the speed of a mechanism (measure time and displacement you have speed), for high precision motion control. This is used in Fourier spectrometer devices but now I'm going too far ;)
 
nice illusion idd,

and CK have i ever told you that you are one FC lad? :lol:
 
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