Normal line - Convex mirrors
To further understand convex mirrors, you will need to understand 'normal' line in relation to convex mirrors.
There are several definitions of the normal line of a convex mirror.
Normal line is the line perpendicular (at 90°) to the tangent line
The normal line is an imaginary line at 90° to where the ray touches the surface.
At Mammoth Memory, we believe it's best to think of a bow held by a Norman warrier as the curve and the Norman's arrow being the normal line.
So, for a convex mirror at the point where the ray of light touches the surface, draw a tangent.
Then draw a perpendicular line (at 90°) to the tangent.
Then you can remove the tangent line.
This is the normal line and is perpendicular to the convex mirror's surface at the point of contact.