Concave mirrors

Principal axis

A line that is perpendicular to and hits the deepest point of the curve of a concave mirror

Center of curvature

Is equal to 2xF(focal point), the point on the principal axis which is the very center of the circle formed by continuing the curve of the concave mirror

Focal point

The point on the principal axis where all parallel lines converge after being reflected or refracted by the mirror

F

Focal point/distance from mirror to focal point(formula terminology)

Di

Distance of mirror to image(reflection of object; always a positive value)(formula terminology)

Do

Distance of mirror to object(formula terminology)

Hi

Length of straight line from principal axis to highest point of image(formula terminology)

Ho

Length of straight line from principal axis to highest point of object(formula terminology)

M

Magnification of the concave mirror diagram(formula terminology)

1/F = 1/Di+1/Do

Formula for distance

M = -Di/Do = Hi/Ho

Formula for magnification and height

Larger, Same, behind the mirror, virtual

In front of Focal point SALT characteristics

No image

On Focal point SALT characteristics

Larger, inverted, beyond center of curvature, real

Between Center of Curvature and Focal point SALT characteristics

Same, inverted, same, real

On Center of Curvature SALT characteristics

Smaller, inverted, between center of curvature and focal point, real

Beyond Center of curvature SALT characteristics