Category : Science Projects And Inventions
YOU NEED:
This experiment is unique and for this you need a special glass. A glass with thick sides and a with a cone shaped interior. Take the marble, place it inside the glass and glue it firmly in place. Apply some glue to the face of the picture and paste it to the underside of the glass with the picture side up. Now paint the bottom of the glass black to hide the picture. Now look down into the glass. Nothing can be seen. Now fill it with water. The magnified picture appears like magic.
HOW DOES IT WORK?
When in the air, the glass sphere acts like a convex lens with a very long focal length. Once you pour water, the sphere is surrounded and this decreases its focal length, allowing it to act like a magnifying glass showing the picture in focus.
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