How do you find the normal line for an incident light ray on a concave mirror?
Draw a line from the outer edge of the curve to the point of contact for the ray.
Draw two lines diagonally from the outer edges of the curve until they intersect each other.
Draw a line from the center of the curve to the point of contact for the ray.
Draw a line perpendicular from the center of the curve to the point of contact for the ray.