Lesson 15 Key Concepts and Notes

Plane mirrors reflect light. 1. Plane mirrors reflect light.

2. A ray of light striking and reflecting from a mirror can be divided into two parts; an incident ray and a reflected ray.

3 The angle of incidence and the angle of reflection are measured from the normal, which is a line perpendicular to the plane of the mirror at the point of incidence.

4 The angle of incidence and the angle of reflection have the same value. This is referred to as the “law of reflection.”

5 Light can be reflected from one mirror to another.

6 The image seen in a plane mirror is a virtual image. Virtual images can be explained using the law of reflection.

Lesson 15 Notes

Incident ray: incoming ray that strikes the object 1. Incident ray: incoming ray that strikes the object

2. Reflected ray: outgoing ray that is reflected from the object

3. Normal: Line perpendicular to the plane of the mirror.

Angle of Incidence: angle between the incoming ray and the normal 4. Angle of Incidence: angle between the incoming ray and the normal

5. Angle of Reflection: angle between the outgoing ray and the normal