Spherical mirror

Spherical mirror（The coming ゅ bear it is today、Spherical mirror) With, spherical surface is designated as counter plane of fire mirror. There is with a concave mirror which designates the inside of sphere as counter plane of fire and a convex mirror which designates the outside as counter plane of fire.

Center of sphere sphere heart, center of mirror extremely, sphere heart and the axis which ties the pole the optical axis. Spherical mirror focal length on optical axis extremelySphere heartIt is half of distance.