Why is it that when you shine a laser through a slit, it has the pattern that it does!
What kind of laser?
What kind of slit?
What kind of pattern?
When I shine a laser pointer through a 1cm slit it makes a single dot pattern on the wall, as expected.
I suspect you are asking about the double slit experiment, or some kind of spectral scattering through a grid of slits though.
A pattern like the one in the image I attached created when a laser shines through a small slit.
The light waves passing through different parts of the slit interfere with each other, and the result is that pattern. Here's an overview:
And here's a graphical method for calculating the intensity pattern:
You can also use integral calculus to calculate it:
Something similar. water waves thought single and double slit
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