Quickly and confidently demonstrate the concept of wave interference. Stack two identical circle patterns together on an overhead projector. Slowly slide one pattern over the other and the interference pattern will clearly develop before your eyes. Then, measure the angles of the interference bands to confirm the relationship between wavelength and slit separation. Repeat the demonstration using the larger-spaced circles to show how the interference pattern is affected by “wavelength.” Circle Pattern Masters are provided and can be photocopied onto transparency paper for students to follow along with the demonstration at their desks. Includes complete demonstration instructions.
Concepts: Interference pattern, wavelength, coherent light, diffraction. Time Required: 15 minutes Note: Requires an overhead projector. Student transparency paper is not provided.
Materials Included in Kit: Acrylic sheet with concentric circle pattern a, 10" x 10", 2 Acrylic sheet with concentric circle pattern b, 10" x 10", 2
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Developing and using models Using mathematics and computational thinking