Physics › Section S · Vision, instruments, and wave optics › Topic S.4
Double-slit and multiple-slit interference
Shine light through two narrow slits and, instead of two bright lines, you get a row of bright and dark stripes. That pattern proved light is a wave, lets us measure wavelengths a millionth of a metre long, and becomes the sharp spectra of a diffraction grating.
In this topic
- Young's experiment
- Path difference
- Bright and dark fringes
- Fringes on the screen
- Worked example: a green laser
- Worked example: measuring a wavelength
- How many fringes?
- Diffraction gratings
- Gratings and spectra
- Worked example: a grating spectrometer
- Common mistakes to avoid
- Key takeaways
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