![]() Also notice that the maximum intensity of the double slit is 4 units, the 3-slit case has a maximum intensity of 9 units, and for 4-slits it is 16 units, as we expect when the amplitude increases by one unit with the addition of each slit. An optical system with the ability to produce images with angular resolution as good as the instruments theoretical limit is said to be diffraction limited. Light of wavelength is incident at an angle and diffracted by the grating (with a groove spacing dG) along a set of. Notice that the bright fringes for any number of slits occur at the same places as for the double slit (provided they have the same slit separation), and that the number of dark fringes between bright fringes goes up by one every time another slit is added. Diffraction also occurs with matter such as electrons. Diffraction occurs with all waves, including sound waves, water waves, and electromagnetic waves such as light that the eye can see. Putting these functions into a graphing calculator confirms what we found above, as well as what we suspect about \(n\) slits – that there are \(n-1\) dark fringes between each maximally-bright fringe.įigure 3.3.3 - Comparison of Interference Patterns by Number of Slits Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the. Diffraction is a physics concept which occurs when waves bend around small obstacles, or spread out after they pass through small openings.
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