1, the structure is different: the convex lens is composed of a transparent mirror with two surfaces polished into spherical surfaces, and the concave lens is composed of a mirror with one concave surface and one opaque surface.

2. The effect on light is different: convex lens mainly converges light, while concave lens mainly diverges light.

3. Different imaging properties: the convex lens can magnify the virtual image upright, the real image upside down and the real image upside down, while the concave lens can only magnify the virtual image upright.

4. Different focal points: convex lens has two real focal points and concave lens has two virtual focal points.

5. Different uses: the convex lens is used for magnifiers, cameras, projectors, etc. Concave lenses are used for myopia glasses.