1. Essential Question: How do images form by reflection?

2. Reflection
Two types of reflection
Regular or Specular
Diffuse

3. Law of Reflection –the angle of incidence = the angle of reflection

4. Characteristics of Images in Plane Mirror

5. Characteristics of Images in Plane Mirror
Image located as far into the mirror as object is in front of mirror.
Virtual Image
Erect Image
Same Size
Reverse left to right
Image form directly in front of object

6. Can a person a position X see the image?
object
image X

7. Draw a line from X to the image.
object
image X

8. If the line of sight crosses the mirror then the image can be seen.
object
image X

9. The red arrows show the actual path of the light.
object
image X

10. Reflection from Parabolic Mirror
Images formed by curved mirrors have different characteristics than those formed from flat mirrors.

11. Terminology of Curved Mirrors
Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F C F
Principal axis

12. Terminology of Curved Mirrors
Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F/ C F
Principal axis
Focus(F) – the point where all rays parallel to axis reflect to; half the distance to C

13. Terminology of Curved Mirrors
Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F/ C F
Principal axis
Focus(F) – the point where all rays parallel to axis reflect to; half the distance to C
Principal axis- the line passing through C, and F and the center of mirror

14. The size and type of image varies with the object’s distance (do) from the mirror.
If the object is so far away that the rays come in parallel, the image will just be a point a the focus.

15. If the object is beyond f the image will always be real and inverted
If the object is beyond f the image will always be real and inverted. The size will vary
If the object is right at f an image will not form.
If the object is less than f away, the image will be enlarged, erect and virtual.

16. The mirror equation: do di

17. Magnification Equation:
h’ is image height
h is object height

18. Images formed in Convex Mirrors:

19. Images formed in Convex Mirrors:

20. Images formed in Convex Mirrors:
Images are always virtual, erect and smaller.

21. Large spherical mirrors have spherical aberration which causes the blurred images
Making the mirror parabolic instead of spherical reduces the spherical aberration