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Properties of Laser Light: Monochromatic

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This science lesson is part one of a three part investigation of what makes LASER light – or the Properties of Laser Light – different from other light. In this lesson, we will demonstrate the monochromatic nature of LASER light by comparing the spectra of white light and colored LEDs to that of LASER light. The other two lessons explore the Collimated and Coherent nature of Laser Light.

Grade Range:

1/2 Hour – 1 Hour


1 Diffraction Grating, 3 Light BLOX in Red/Green/Blue, White LED, 1 Red LASER Pointer  or Laser Blox, a blank wall/screen

NGSS Connections

PS4.B: Electromagnetic Radiation

  • Communicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy (HS-PS4-5)