On the Fringe (formerly Bridge Light)

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In this activity, learners trap a thin layer of air between two pieces of Plexiglas to produce rainbow-colored interference patterns. Learners bend, twist, or press on the plates to observe patterns and then compare what happens when they place red plastic between the light source and the plates. Use this activity to introduce learners to constructive interference and destructive interference.

Quick Guide

Preparation Time:
5 to 10 minutes
Learning Time:
10 to 30 minutes
Estimated Materials Cost:
$1 - $5 per student
Age Range:
Ages 8 - 18
Resource Type:
Activity
Language:
English

Materials List (per student)

  • 2 sheets of Plexiglas™, 1/4 or 1/8 inch (.64 or .33 cm) thick and approximately 1 foot (30 cm) square. (Size is not critical.)
  • 1 piece of dark construction paper
  • One 3 x 5 inch (8 x 13 cm) piece of transparent red plastic
  • Electrical or duct tape
  • A light source, such as a desk lamp

Keywords

Subjects

  • Life Sciences
    • Human Senses and Perception
      • Vision
  • Physical Sciences
    • Vibration and Waves
      • Diffraction and Interference
    • Light and Optics
      • Reflection and Refraction
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations

Audience

To use this activity, learners need to:

  • see
  • see color
  • touch

Learning styles supported:

  • Involves hands-on or lab activities

Other

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Access Rights:

  • Free access

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