A convex lens is used as a magnifying glass to read small print.

Convex lens, object beyond $2F_1$: a smaller real inverted image between $F_2$ and $2F_2$, as in a camera. Object at $2F_1$: the same size, at $2F_2$. Object between $F_1$ and $2F_1$: a larger real image beyond $2F_2$, as in a projector. Object inside $F_1$: a larger virtual upright image on the object's side, as in a magnifying glass. A concave lens always gives a smaller, virtual, upright image.