Convex lens use – Magnifying glass
A magnifying glass is really a convex lens mounted in a frame with a handle.
It's used to enlarge items such as writing so it can be read more easily.
A magnifying glass tricks your eyes into believing there is something bigger behind the lens.
This magnification only works when the object being viewed is between the lens and one principal focal length.
For a magnified image to be observed, the distance between the object and the lens has to be shorter than the focal length of the lens.
The image formed is upright, magnified and virtual.
