Draw two arrows on a piece of paper one above the other and both pointing in the same direction. Place an empty glass tumbler in front of them. Now add water to the tumbler. As soon as the water level crosses the lower arrow -- the arrow will magically change direction. This happens because the water filled glass acts like a convex lens. Repeat the same fun experiment with a pair of fishes.
http://arvindguptatoys.com/toys/Funwithwaterlens.html This work was supported by IUCAA and Tata Trust. This film was m
آی-ویدئو