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**The bouncing off of light as it hits a surface**

Reflection of Light The bouncing off of light as it hits a surface

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**Types of Reflection Regular Reflection a.k.a. specular reflection**

When parallel rays are reflected parallel Reflecting surface is smooth

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Regular Reflection

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**Types of Reflection Irregular Reflection a.k.a. diffuse reflection**

When parallel rays are reflected in different directions Reflecting surface is not perfectly smooth

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Irregular Reflection

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**Important Terms Object Image The source of light**

The picture of the object that is formed from the reflected rays

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Important Terms image object

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**Important Terms Incident Ray Reflected Ray Normal**

Light ray that hits a surface Reflected Ray Light ray that bounces off the surface Normal Line that is perpendicular to the reflecting surface

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incident ray normal reflected ray mirror

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**Important Terms Angle of incidence Angle of reflection**

Angle between the normal and the incident ray Angle of reflection Angle between the normal and the reflected ray

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incident ray Angle of incidence normal Angle of reflection reflected ray mirror

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Investigation

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**#1 The angle of incidence equals the angle of reflection.**

Laws of Reflection #1 The angle of incidence equals the angle of reflection.

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Laws of Reflection #2 The incident ray, the reflected ray and normal all lie in the same plane. This means they can all be drawn on a flat sheet of paper.

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**Ray Diagrams for Plane Mirrors**

Virtual Image

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Virtual Image Image formed by rays which seem to come from it but do not pass through it Cannot be produced on a screen

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**Ray Diagrams for Plane Mirrors**

Same Distance

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**Ray Diagrams for Plane Mirrors**

Same Size

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**Ray Diagrams for Plane Mirrors**

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**Ray Diagrams for Plane Mirrors**

Laterally inverted Left and right are interchanged !

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Lateral Inversion When left and right are interchanged

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**Properties of the Image**

Virtual Object distance equals image distance Same size Laterally inverted

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**Seeing and Ray Diagrams**

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**Seeing and Ray Diagrams**

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**Ray Diagrams for Plane Mirrors**

When the eye is above the object

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**Ray Diagrams for Plane Mirrors**

When the eye is behind the object

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**Ray Diagrams for Plane Mirrors**

When the eye is in front of the object

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**Ray Diagrams for Plane Mirrors**

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Uses of Reflection Reflectors for bikes and roads

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Uses of Reflection Reflectors for photography

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Uses of Reflection Rear-view mirrors

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Uses of Reflection Medical mirrors Telescopes

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CH 32: geometric optics. Reflection: Reflection is the simplest method for changing the direction of light. Reflection – Light incident on a boundary.

CH 32: geometric optics. Reflection: Reflection is the simplest method for changing the direction of light. Reflection – Light incident on a boundary.

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