Convex Mirror Ray Reflection Principle

When a ray of light travels parallel to the principal axis of a convex mirror, it strikes the mirror's surface.

Convex mirrors are diverging mirrors. This means that any parallel incident ray, upon reflection, will bend outwards, away from the principal axis.

To understand where this reflected ray appears to come from, we trace it backward behind the mirror. This backward extension of the reflected ray will intersect the principal axis at a specific point. This point is the principal focus (F) of the convex mirror.

Analysis of Options

• Centre of Curvature (C): Rays directed towards C reflect back along the same path. Parallel rays do not diverge from C after reflection.
• Principal Focus (F): This is the point from which rays parallel to the principal axis appear to diverge after reflection in a convex mirror.
• Infinity: While parallel rays are related to infinity, in a convex mirror, the divergence point is finite (the focus), not infinity itself.
• Pole (P): The pole is the center of the mirror. Reflection at the pole follows the law of reflection, but parallel rays do not appear to diverge from the pole after reflection.

Therefore, a ray parallel to the principal axis after reflection from a convex mirror appears to diverge from the principal focus.