Refraction Through a Glass of Water
To see refraction through a glass of water.
a glass of water, stiff sheet of paper to make slits, screen
Cut two slits on a stiff piece of paper. Make it stand by fixing it over a window on one side of a cardboard box. Remove the opposite side of the box and let sunlight or torchlight fall on the slits to create `rays'. Place a cylindrical tumbler filled with water in the path of the rays. You will find that the direction of the rays change after refraction. We use the refraction at a curved surface to make lenses.