1. Aim: How does a light ray interact with different mirrors?
Do Now: From rest, how long does it take a 5kg bowling ball to fall from 10m high?
HW: Ray Diagram Sheet (Mirrors)

2. Plane mirrors What do you see when you look into a mirror?
A reflection…
Ok, that was kinda obvious, but this next question is not!
Where is your reflection or “image” located?

3. Mirror
A mirror is an optical device that forms an image by reflecting light.
Plane Mirrors: Flat mirror
Mirror
object
image so si

4. Virtual image- no light bounces off the image, just the mirror!
Real image- Light rays actually focus at the image.
Lets look at a Real image!
Mirror
object
image
Real image Demo: Concave mirror mirage maker so si

5. 4 Big Questions for Mirrors & Lenses
Where is the image?
Is the image real or virtual?
Is the image upright or inverted?
What is the height of the image (compared to the object)?

6. Parabolic mirrors Mirrors can be concave or convex. “Concave” C f axis
f: mirror focal length (how well light is converged or diverged)
C: Center of curvature or “center point”. C = 2f
“Concave” C f
axis

7. Parabolic Mirrors

8. Drawing Ray Diagrams “Concave” C f Always draw these the same way!
Image at intersect!
This answers our 4 questions!
Real, smaller, inverted image between C and f!
“Concave”
object C f
image
Real images are projectable!

9. Challenge!
For the same type of Mirror try drawing the ray diagram for an object:
Between C & f
At f
In front of f

10. Convex Mirror- Mirror Curves Away
What kind of image is this?
Image is always between f and mirror, behind mirror.
Always smaller
Always right side up
Always Virtual
“Convex” f
Virtual C

11. Summary
When we look into a plane mirror, what kind of image do we see? How do you know?
What are the 4 big questions we ask when drawing ray diagrams?
How is a concave mirror different from a convex mirror?