Traditional Culture Encyclopedia - Photography major - Cup refraction photography

Cup refraction photography

A colorless transparent cup filled with water is actually a convex lens. What you see is a virtual image. Because the focal length of this lens is very short. When the pen is far away, the virtual image disappears when it exceeds the focal length. An inverted real image is formed on this side of the human eye. . You can't see this. I wish I had a screen.