1. 11.4 The Ray Model of Light

2. Light Ray
A line and arrow representing the direction and straight-line path of light

3. Incident Light Light emitted from a source that strikes an object
Incident Light Ray

4. Properties of Light When light strikes matter, it can be…
1. Transmitted – light passes through a substance
2. Reflected – light bounces off an object
3. Absorbed – light is absorbed by object and converted to heat

5. Flat/Plane Mirrors Image: Mirror
A reproduction of an original object that is produced through the use of light
Mirror
A polished surface reflecting an image

6. Mirrors

7. Terminology of Reflection

8. Terminology of Reflection
NORMAL

9. Terminology of Reflection
NORMAL
Incident Ray

10. Terminology of Reflection
NORMAL
Angle of incident
Incident Ray

11. Terminology of Reflection
NORMAL
Angle of incident
Incident Ray
Reflected Ray

12. Terminology of Reflection
NORMAL
Angle of incident
Angle of reflection
Incident Ray
Reflected Ray

13. 11.6 Laws of Reflection: Plane (flat) mirrors

14. Matter can be classified as:
Transparent
Transmits all or almost all incident light, object can clearly be seen through material
Ex. Clear glass

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

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

17. 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

18. 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

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

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

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

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

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

24. Images in Plant Mirrors
Pg Leonardo da Vinci’s handwriting

25. 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

26. 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

27. Reflection Worksheet Complete the worksheet
Remember that the virtual image must be the same difference from the mirror as the real object

28. How do we see the image?

32. Properties of an Image
Use the acronym SALT

33. Sample Question

34. Sample Question

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