Principle of water droplet imaging

Answer: Because the water drop is equivalent to a convex lens, it is also an ordinary magnifying glass, which looks like an enlarged inverted reality! (This is based on a flat mirror. If it is on a light screen, the object distance is more than twice the focal length, and the distance is less than twice the focal length, which will present the reality of inversion and reduction! )

Water droplets are similar to spherical semi-convex lenses superimposed on a plane mirror. According to the imaging principle, light refracts when it passes through the convex surface, forming an inverted image. If the water on the mirror surface is large enough, a convex lens cannot be formed, and the imaging will only have a certain refractive effect, but will not form an inverted image. The imaging of water on the ground is very simple. The image we see is only the image of reflected light on the water surface, and the light reflected by refracted light is weakly ignored.