Fringes on a Screen
Part of the Optics, Waves and Modern Physics section of Coddy's Physics journey. Lesson 30 of 53.
On a screen L away, the fringes are evenly spaced:
Δy = λL / d
650 nm, d = 0.2 mm, L = 1 m: Δy = 3.25 mm.
Longer λ, farther screen, or closer slits: wider fringes.
Challenge
Light of wavelength 650 nm falls on two slits 0.2 mm apart. The screen is 1 m away. How far apart Δ y are neighbouring bright fringes, in mm?
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 String