1. Plane Mirrors

2. The Laws of Reflection
The angle of reflection always equals the angle of incidence
The incident ray, normal, and reflected ray all lie in the same plane

3. Two Laws – Label the Diagrams

4. Regular and Diffuse Reflection
regular reflection – the reflection of light off a smooth surface
produces a clear reflection
diffuse reflection – the reflection of light off a rough surface
the reflection is not clear

5. The Characteristics of an Image “SALT”
Size – larger, smaller , same
Attitude – whether the image is upright or upside down
Location – behind, in front or on the surface of the mirror
Type – real or virtual
real – light rays meet the image
virtual – light rays do not meet the image
EX. an image in a mirror

6. SALT - Size

7. SALT - Attitude

8. SALT - Location

9. SALT - Type

10. Constructing a Ray Diagram
STEP 1
Draw an incident ray from the starting position on the image.

11. Constructing a Ray Diagram
STEP 2
Draw the corresponding reflected ray

12. Constructing a Ray Diagram
STEP 3
Extend the reflected ray behind the mirror using a dotted line.

13. Constructing a Ray Diagram
STEP 4
Repeat steps 1-3 selecting a different incident ray from the same starting position.
The point at which the two reflected rays intersect (cross) is the starting position for the reflected image. Draw this point.

14. Constructing a Ray Diagram
STEP 5
Repeat steps 1-4 for the ending position of the image

15. Characteristics of Images in a Plane Mirror
The image is upright.
The image is the same size as the object.
The image is virtual.
The image is the same distance behind the mirror as the object is in front of the mirror.