1. 11.6 Laws of Reflection: Plane (flat) mirrors

2. Three ways to Classify Matter:
Transparent
Transmits all or almost all incident light, object can clearly be seen through material
Ex. Clear glass

3. Matter can be classified as:
Translucent
transmits some incident light but absorbs or reflects the rest, objects are not clearly seen through material

4. Matter can be classified as:
Opaque
Does not transmit any incident light, objects are not seen through material

5. Try this:
Classify each of these materials as transparent, translucent or opaque:
A textbook
Frosted glass
A single sheet of tissue paper
A clean sheet of glass
A rock
Apple juice
Sunglasses

6. Try this:
Classify each of these materials as transparent, translucent or opaque:
A textbook- OPAQUE
Frosted glass- TRANSLUCENT
A single sheet of tissue paper- TRANSLUCENT
A clean sheet of glass- TRANSPARENT
A rock- OPAQUE
Apple juice- TRANSLUCENT
Sunglasses- TRANSPARENT

7. From our lab, we learned… The Laws of Reflection
1. angle of incidence = angle of reflection 2. The incident ray, reflected ray and the normal all lie in the same plane

8. Light Reflecting off Surfaces
Regular (Specular) Reflection: Reflection of light off a smooth shinny surface (ex. mirror)

9. Light Reflecting off Surfaces
Regular (Specular) Reflection: Reflection of light off a smooth shinny surface (ex. mirror)

10. Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving water)
SHOW DEMO

11. Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving water)

12. 11.7 Images of Plane Mirrors

13. Virtual Images
An image formed by light coming from an apparent light source
Light is not arriving at or coming from the actual image location - the object is not actually behind the mirror

14. Characteristics of Images in a Plane Mirror
Lateral Inversion:
The orientation of an image in a plane mirror that is backwards and in reverse order

15. Properties of an Image
Use the acronym SALT

16. How do we see the image?

18. Draw the Image:

19. Sample Question
S- same size
A- upright
L- 2 cm from mirror
T- virtual

20. Sample Question

21. Reflection Worksheet Complete the worksheet
Remember that the virtual image must be the same difference from the mirror as the real object
Use equal perpendicular lines to locate the image

22. Homework:
Work Sheet
Pg 486 # 2-5
Pg 493 # 1-4, 7