Dewbow Dewdrops...are large enough so that the bizarre, hyperbola-shape dewbow seen lying on dewy grass after sunrise shows all the rainbow's colors. The hyperbola results from the flat ground intersecting the 42°-radius cone of the rainbow, the apex of which is at your eye. If the dew lasts well into the day, the dewbow will become a parabola and then an ellipse as the Sun gains altitude.









