1. Light Rays

2. Even though light is a wave, we often draw light as a straight arrows that point in the direction the light is going.
These arrows are called “Rays”

3. Reflection of Light Copy the following diagram into your notes. Normal
(Perpendicular to the surface)
Normal
Incident Ray
angle of
incidence
angle of
reflection
Reflected Ray Өi Өr
Mirror
Contact point

4. The Law of Reflection
When light bounces off of something, the angle of incidence is always equal to the angle of reflection.
Normal
Incident Ray
Reflected Ray Өi Өr
Note: Each angle is measured from the Normal, and not from the surface.

5. Drawing Ray Diagrams helps us predict how light will behave, and how images are formed.

6. Өr Өi

7. Өr Өi

10. Practice
Which eyes would see the object in the mirror?

11. Practice
Copy the image into your notebook and locate the image in the mirror. You only need to consider the rays of two points on the object to construct the image.

12. Operation Sunshine
Can you get the
Sun’s Rays through
the space maze
and to Earth