Khan Academy
Khan Academy: Objects in the Mirror Are...' Actually Images in the Mirror
This article from Khan Academy provides information about mirrors. This information is intended for the Class 12 Physics Course (India).
Physics Classroom
The Physics Classroom: Reflection/ray Model of Light: Mirror Portion Required
A tutorial which demonstrates how ray diagrams can be used to determine what portion of a plane mirror must be used in order to view an image.
Physics Classroom
The Physics Classroom: Refraction/ray Model of Light: Image Formation Revisited
Students take an in-depth look at the physics behind image formation.