Add more slits and the bright fringes get sharper and brighter. This is how a diffraction grating splits light into precise, well-separated spectral lines.
Diffraction GratingLive
N-slit interference
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More slits make the bright maxima sharper and brighter — the principle behind spectrometers that split light into precise spectral lines.
Reading this result: The bright maxima stay locked where d·sinθ = mλ — fixed by spacing and wavelength, not slit count — but with 5 slits each principal peak is about 5× narrower and far more intense, which is how a grating resolves fine spectral lines.
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How it works
An N-slit grating produces intensity maxima where d·sinθ = mλ, and the peaks narrow as the number of slits grows (resolution ∝ N). Gratings are the heart of spectrometers used across chemistry, astronomy, and materials analysis.
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