1. Images formed by Mirrors

2. What are some uses of mirrors?

3. Plane Mirrors How can we describe images formed by plane mirrors? Size
Same size as object
Magnification = 100%
Attitude
Upright
Location
Behind the mirror
Image appears to be the same distance from mirror as the object
Type
Virtual

4. Curved Mirrors Two types
Concave: focuses parallel beams of light to a point
Convex: spreads out parallel beams of light

5. Curved Mirrors

6. Curved Mirrors

7. Vocabulary Label the following on the diagram below:
Center of curvature Focal point Incident ray Principal axis Reflected ray Object Mirror
Is the mirror above convex or concave?

8. Types of Images Real images Virtual images
Image formed by actual light rays coming together (converging)
Use a screen to see the image formed
Virtual images
Image formed by “virtual” light rays (dotted lines)
Image cannot be seen on a screen

9. How to Draw Concave Mirror Diagrams
Instructions
Diagram
Draw a ray from the top of the object parallel to the principal axis.
This ray will reflect through the focal point.
Draw a ray from the top of the object through the focal point and on to the mirror.
This ray will reflect parallel to the principal axis.
Extend the reflected rays until they cross. (If you need to extend the reflected rays behind the mirror, use dashed lines.)
The point where the rays meet is the top of the image.

10. Cases for Concave Mirrors
Image is…
How to see image
Diagram
Object between C and F
Larger
Inverted
Real
Use a screen placed in front of mirror.
Object at F
No image formed
Object between F and mirror
Upright
Virtual
Observer looks into mirror to see image.

11. Practice: Concave Mirror Diagrams

12. How to Draw Convex Mirror Diagrams
Instructions
Diagram
Draw a ray from the top of the object parallel to the principal axis.
This ray will reflect as if it came from the focal point.
Draw a ray from the top of the object toward the focal point (stop at the mirror).
This ray will reflect parallel to the principal axis.
Extend the reflected rays behind the mirror using dotted lines until they cross.
The point where the rays meet is the top of the image.

13. Cases for Convex Mirrors
Image is…
How to see image
Diagram
All distances in front of the mirror
Smaller
Upright
Virtual
Observer looks into mirror to see image.

14. Practice: Convex Mirror Diagrams

15. What kind of mirrors are being used?

16. End here!

17. Vocabulary Center of curvature Concave Convex Focal point Incidence
Incident ray
Normal
Plane
Principal axis
Real
Reflected ray
Reflection
Virtual