^Concave mirror & Convex lens
A concave mirror has outer or bulged side polished. A convex lens is thick near center & thin near the edges. They have following common features
- Real focus
- Converge light rays striking on them
- Positive optical power
- Can form several type of images such as diminished, enlarged, same size, real virtual image of a real object
- Can’t form a diminished & virtual image of a real object.