Making Glass Invisible
Grade Level: 5th to 8th; Type: Physics
This experiment makes glass go completely invisible.
- What happens to light as it passes through glass?
- Why are the edges of the glass still slightly outlined?
Glass is see-through, but usually you can still see that it is there. In this experiment we make glass go completely invisible.
- Baby oil
- Large clear glass bowl
- Clear glass cup small enough to fit into the bowl
- Fill the bowl with baby oil until the oil has a depth of slightly less than the height of the cup.
- Place the cup into the baby oil taking care not to allow oil to pour over into it. You can still see that the cup is in there, right?
- Now slowly pour baby oil into the cup. Observe the cup gradually disappearing as it fills with baby oil.
Terms/Concepts: refraction, light, speed of light, invisibility
- Refraction: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html
- Speed of Light: http://www.colorado.edu/physics/2000/waves_particles/lightspeed-1.html
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