Optics: Fraunhofer diffraction - thin wires | MIT Video Demonstrations in Lasers and Optics

[@khairuannas2172]

Excuse me. May I know why the laser must go through 2 mirrors before go directly into 4 wires? Is it okay just to go directly to the wires without reflecting the mirror? The mirror used for reflect, is it 45 degree? and why the laser have the wavelength of 6328 angstroms? and why the distance between wire and screen is 200cm?

[@veaccardi]

Would any know if the thinnest wire used in this experiment was about 0.050 mm (AWG 44)?

[@elizabethaugustin5494]

Why it's called frounhoffer diffraction?