Just one drop

the water droplet in the picture acts as a double convex lens, or, since the droplets lens is thicker in the middle, a converging lens. the wooden tulip is unquestionably the focal point of the lens, so, by drawing three rays — one parallel to the axis and through point F, another passing through F’ and emerging parallel, and a third passing through the center of the lens and continuing in the same direction — the image point is found as being oppo site of the actual image point, resulting in an inverted image.

Done