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Concave Mirror
Convex Mirror
- Principal axis is the line through the centre of curvature and the pole of the mirror.
- Pole is the point where principal axis meets with mirror surface.
- Centre of curvature is the centre of sphere that the mirror forms part.
- Radius of curvature (r) is the radius of sphere.
- Principal focus is the point to which all rays parallel to the principal axis converge or from which they appear diverge.
- Focal length (f) is the distance between the pole and the principal focus.
- Parallel reflected rays converge at focal point.
- Real focus since the reflected rays actually pass through it.
- Parallel reflected rays appear to diverge from focal point.
- Virtual focus since the reflected rays do not pass through it.
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