American Buddhismâs numbers are booming. Published just over three years ago, an American Religious Identification Survey survey showed that from the years 1990 to 2000, Buddhism grew 170 percent in North America.
However, for a lens, a positive image distance implies that the image is located on the opposite side as the object. Virtual images are formed by concave lenses or by placing an object inside the focal length of a convex lens. The ray-tracing exercise is repeated for the case of a virtual image. In this case the virtual image is upright and shrunken. The same formula for the image and object distances used above applies again here.
These curved pieces of glass are called LENSES. As light passes through them it is bent in a special way, following a certain order. How convex and concave lenses bend light as it passes through them Just as there are convex and concave mirrors, so there are convex and concave lenses. In a convex lens, the glass bulges out from the edge to the center, while in a concave lens it curves the other way.