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I placed a jar of water on the overhead projector and shined white light down through the water. Rainbows--colors--were formed on the ceiling and walls of the classroom. This proved that color does not come from an object but from the light that shines on the object.
I placed a jar of water on the overhead projector and shined white light down through the water. Rainbows--colors--were formed on the ceiling and walls of the classroom. This proved that color does not come from an object but from the light that shines on the object.
Here's a nice little activity that helps kids understand polarized light clearly, first time. Take two pairs of polarizing sunglasses (any old sunglasses will not do - they must have polarizing lenses). Hold them together and look through. Then slowly rotate one pair, keeping the other pair still, and this is what happens.
More in our article about light.
Our images are published under a Creative Commons Licence (see opposite) and are free for noncommercial use. We also license our images for commercial use. Please contact us directly via our website for more details.
When the two lenses are at 90 degrees to one another, the image will disappear altogether. Each lens allows light rays through in only one direction (plane). So with two lenses turned at 90 degrees, no light rays get can get through at all.
More in our article about light.
Our images are published under a Creative Commons Licence (see opposite) and are free for noncommercial use. We also license our images for commercial use. Please contact us directly via our website for more details.
As you rotate one lens, notice how the image you see gets darker. Keep rotating and this is what happens next.
More in our article about light.
Our images are published under a Creative Commons Licence (see opposite) and are free for noncommercial use. We also license our images for commercial use. Please contact us directly via our website for more details.
I placed a jar of water on the overhead projector and shined white light down through the water. Rainbows--colors--were formed on the ceiling and walls of the classroom. This proved that color does not come from an object but from the light that shines on the object.
A two liter soda bottle is filled with 400ml of water and pressurized to 8 atmospheric pressures.
When the bottom clamp is released, the soda bottle becomes a rocket that can reach a height in excess of 150 meters. This activity is used with students to study rockets. This rocket is photographed with a high speed flash.