6C10.20 Two Finger Slit

Concepts

Interference, diffraction

Overview

This is a simple experiment to show the diffraction pattern of a light passing through a small slit formed by two fingers held together close to the eye.

Details

Equipment

  • [1] Light bulb with vertical filament
  • [1] Bulb socket

Script

  1. Place the light bulb somewhere in the classroom where it is visible to all students.
  2. Ask students to look at the light bulb through a small slit formed by holding two fingers together close to their eye.
  3. You should see a diffraction pattern that changes as you increase or decrease your finger gap.

 

Additional Resources

References

  • PIRA 6C10.20

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2017

Technicals

Related AV

Related demos

 

If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.