Did you know? Human eye has a convex lens which can automatically changes its focal length. Changing in focal length helps eye create clean images of objects located at various distances. According to the feature of convex lens, if an object changes its position , then the position of image will also change. But in case of eye, all images are made on retina which maintains fixed distance with the eye lens. In other words, objects are positioned at various locations, yet their clear images are created on retina. It is possible because human eye lens can automatically change its size as well as its focal length. #Science