1. Images in Curved Mirrors

2. Centre of Curvature Centre of curvature = centre of sphere
Called point C C
Line going through C and hitting middle of mirror is the principal axis
Where principal axis meets mirror is called the vertex V
Convex mirror
Concave mirror

3. Part I - Concave Mirrors
Reflective surface on the inner surface of sphere
aka converging mirror
Hint: you go “inside” a “cave”

4. Concave Mirrors…focus!
Light rays that are parallel to principal axis are reflected off a concave mirror and converge through a single point
Point is called the focus, labeled F
VF is half the distance of VC (or C is 2F) F V

5. Reflection in a Concave Mirror
A light ray parallel to the principal axis is reflected through the focus
A light ray through centre of curvature (C) will reflect back on itself
A ray through F will reflect parallel to the principal axis
A ray aimed at the vertex will follow the Law of Reflection 4 3 1 2 F C

6. Images in a Concave Mirror
Blue line – across top of object; reflected through focal point
Purple line – across top of object & through focal point; reflected parallel to principal axis
Yellow line – through C and across top of object; reflected back on itself

7. Activity! In your lab groups, conduct investigation 11.10 on Pg. 502
Complete Part A and Part B #1-8
Don’t go any further than #8 for now!

8. Part II - Convex Mirrors
Reflective surface on the outer surface of sphere
aka diverging mirrors
Used in store security

9. Convex Mirrors Rays always diverge Known as diverging mirrors
Reflected rays never cross in front of mirror
Always a virtual image

10. Reflection in a Convex Mirror
Draw parallel line across top of object; reflected in a line that would go through F
Draw a line across top of object and through F; reflected parallel to principal axis
Draw line across top of object and through C; reflected back onto itself F C

11. Images in a Convex Mirror

12. Activity!
In your lab groups, continue working on Investigation on Pg. 502
Finish Part B #9-11 and complete questions (a) to (l) on Pg. 503