In this part, we’ll demonstrate that LASER light is collimated by comparing the area of light produced by LED lights to that of LASER light at various distances.
Grades: 9 to 14
Duration: 1/2 Hour – 1 Hour
NGSS HS-PS4-5 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.
This activity will showcase one of the properties of LASER light that makes it so unique – Collimated. Start with the video.
Next, stick one a blank sheet of paper against the wall, in line with the table top.
How much does the light spread as it travels?
Hold a RED Light Blox 1” from the paper on the wall, and switch it on. Use a pen or pencil to trace the area of the circle (or rectangle) of light created. Repeat at 3” and 6”.
Remove the paper from the wall and calculate the area of each of the circles. Record your data in the table.
Repeat steps 4 and 5 with the red LASER pointer.
What do you notice about the size of the circle of light from the Lazr finger, and/or that of the rectangle from the Light BLOX at various distances from the wall? What could this mean, considering the nature of the light produced?
What do you notice about the size of the circle/ellipse of LASER light at various distances from the wall? What could this mean?