The type of image formed by a convex lens depends on the lens used and the distance from the object to the lens. Cameras and eyes contain convex lenses. For a distant object that is placed more than ...

Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’. People who are ‘short sighted’ ...