Light Through Two Slits
Part of the Optics, Waves and Modern Physics section of Coddy's Physics journey. Lesson 29 of 53.
Young's two slits gave bright and dark fringes: light is a wave.
Bright where the path difference d sin θ is whole wavelengths:
d sin θ = nλ
n = 0 straight ahead; n = 1, 2, ... on each side.
Challenge
Red light of wavelength 650 nm passes through two slits 0.2 mm apart. At what angle θ is the first bright fringe beside the middle (n = 1)?
Try it yourself
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Optics, Waves and Modern Physics
1Reflection and Refraction
Reflection of LightThe Refractive IndexSnell's LawTotal Internal ReflectionDispersionApparent DepthRecap - Optical Fiber4Mechanical Waves
What a Wave IsTwo Graphs of a WaveWhen Pulses MeetInterferenceStanding WavesHarmonicsRecap - Guitar String3Thin Lenses
Lenses and Their RaysThe Lens EquationVirtual ImagesTwo LensesA Lens and a MirrorRecap - Build a Projector6Light as a Wave
Light Through Two SlitsFringes on a ScreenDiffraction by One SlitThe Diffraction GratingRecap - Measure with a CD