Real image (such as the images on the right), real rays of light are always represented by full, solid lines; perceived or extrapolated rays of light are represented by dashed lines. A real image occurs where rays converge, whereas a virtual image occurs where rays only "appear" to converge. Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point and this real image is inverted. As the object approaches the focal point the image approaches infinity, and when the object passes the focal point the image
Concave-eared torrent frog thin eardrums recessed in their ears, which allows for the ear bones that connect the drum to sound processing part of the ear to be shorter and lighter. Most frogs have thick eardrums close to the surface of the skin and can only hear frequencies below 12 kilohertz. Concave-eared torrent frogs have been recorded chirping at 128 kHz. Concave-eared torrent frog Odorrana tormota, also known as the concave-eared torrent frog, is a species of frog native to China. Its distribution is restricted to Huangshan Mountains in Anhui and Jiande and Anji counties in northern Zhejiang. It occurs in fast-flowing streams