by Kajan Juraj (email@example.com
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Young’s double-slit experiment. Here pure-wavelength light sent through a pair of vertical slits is diffracted into a pattern on the screen of numerous vertical lines spread out horizontally. Without diffraction and interference, the light would simply make two lines on the screen.
Double slits produce two coherent sources of waves that interfere. (a) Light spreads out (diffracts) from each slit because the slits are narrow. These waves overlap and interfere constructively (bright lines) and destructively (dark regions). We can only see this if the light falls onto a screen and is scattered into our eyes. (b) The double-slit interference pattern for water waves is nearly identical to that for light. Wave action is greatest in regions of constructive interference and least in regions of destructive interference. (c) When the light that has passed through double slits falls on a screen, we see a pattern such as this.
Experiments on our laser bench
with a knife, we cut slits with different slit distance, (match for dimension reference)
experimental installation setup
slit with numbers 1-4
laser at low power aimed at the slit number 1
laser at full power aimed at the slit number 1
interference pattern from slit number 1
laser aimed at the slit number 3
interference pattern from slit number 3
cut single slit (in the blue cross)
laser at low power aimed at the single slit
interference pattern from a single slit