# Answer to Question #46978 in Optics for victor

Question #46978

The focal length of a curved mirror is -------- the radius of the spherical surface.

twice

equal to

half

one-quater

twice

equal to

half

one-quater

Expert's answer

By the geometry of the curvedmirrors, all rays which parallel to the optical axis will gather in the point

which is

which is

**half**of spherical surface of the radius

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