Two circular waves with a distance of 4 cm have a wavelength of 0.5 cm.
You will need a double slit, laser light and a screen.
A red laser with a wavelength of 630 nm and a green laser with 530 nm is used. The slit width ist 500 nm, the two slits are separated 0.02 mm and the distance between slit and screen is 70 cm.
A wave with the wavelength of 500 nm is hitting the surface at an angle of 45 °. As medium we use air and glas with a refractive index of 1.45.
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The soapbubbles do have fabulous colors.
diffraction | the spreading of waves into the area of the geometrical shadow |
interference | superimposed waves which are amplified or wiped out |
crest | the highest point of a wave (deutsch: Wellenberg) |
trough | the deepest point of a wave (deutsch: Wellental) |
constructive and destructive interference | Constructive interference occurs if two wavefronts do not have any optical path difference. Destructive interference occurs if the optical path difference is half the wavelength. |
single slit interference | The diffraction at a single slit causes interference. |
double slit interference | Interference due to different wavefronts form two slits. |
interference on thin layers | on thin layers the optical path difference is so small that interference occurs. |