OBJECTIVES 1) Trace light rays as they reflect from a plane mirror. 2) Draw conclusions about the law of reflection. 3) Identify angle of incident and angle of reflection. 4) State the laws of reflection of light.

Using ray boxes

Reflection Draw around the mirror

Reflection normal

Reflection normal

Reflection normal

Reflection normal Angle of incidence

Reflection normal Angle of incidence

Angle of incidence = Angle of reflection Normal Incident ray Reflected ray Angle of incidence Angle of reflection Mirror

Law of Reflection angle of incidence = angle of reflection Can you copy please? normal Angle of incidence Angle of reflection mirror angle of incidence = angle of reflection

Angle of incidence = angle of reflection

THE LAW OF REFLECTION The angle of incidence is equal to the angle of reflection. The image in a plane mirror is virtual and is the same size as the object. Plane mirrors are used in periscopes. They are used in rear view mirrors. The image is as far behind the mirror is as the object is in front. Image is laterally inverted

Using mirrors Two examples: 2) A car headlight 1) A periscope

PERISCOPES

Shiny smooth surfaces reflect regularly, other surfaces also reflect light but if the surface is rough the light is reflected in all directions. We call this diffuse reflection.

Diffuse Reflection