Answer:
Incident Ray:- A ray of light that strikes a surface.
Focal point:- Location where parallel rays of radiation meet after being refracted or reflected.
Principal axis:- Line passing through the center of the surface of a lens or spherical mirror.
Focal length:- Distance between the center of a convex lens or mirror and the focal point of the lens or mirror.
Normal:- A line perpendicular to the surface at a particular point.
Convex:- Curving outward with edges pointing away from the viewer .
Refracted:- Changed direction after passing from one medium to another.
Concave:- lens or mirror curving inward so the edges point toward the viewer.
Reflected:- bounced off of a surface.