1. Lesson 3

2.  describe, quantitatively, the phenomena of reflection  use ray diagrams to describe an image formed by thin lenses and curved mirrors

3. The Law of Reflection < i = < R Angle of Incidence = Angle of Reflection * The angles of incidence and reflection are always MEASURED TO THE NORMAL.

4. Example 1 80 ° Calculate  R Example 2 30 ° Calculate  R Example 3 10 ° Calculate  R off of Mirror B 150 ° A B *

5. Example 4 Calculate < R off of Mirror C C B A 30 ° *

6.  …is the image that “appears” to be on the  far side of the mirror.  … inverts horizontally but not vertically.

8.  Draw rays from object to each observer.  Ray reflects at mirror so θi= θR  Draw virtual ray from reflected rays to behind the mirrors  Virtual image is where virtual rays meet

9. CharacteristicDescription magnification same size, enlarged or diminished attitudeerect or inverted position displacement from mirror surface typevirtual or real

10.  Concave mirrors curve away from the observer.  aka: converging mirror  Convex mirrors curve toward the observer.  aka diverging mirror

11.  C: center of curvature  r: radius of curvature  V: vertex  PA: principal axis  F: principal focal point  f: focal length r = 2f

12. 3 2 1 object image f

13.  Travels from object parallel to principal axis.  Ray will reflect through focal point (converging mirror)  or appear to have originated from focal point (diverging mirror)

14.  Ray travels from point on object: and passes through focal point (converging mirror)  or is directed toward focal point (diverging mirror)  will reflect back parallel to principal axis.

15.  Travels from point on object toward the center of curvature  Ray will reflect back along the incident path The Intersection of rays...will be the location of the image

18. VII - 18

19. VII - 19

20.  Objects are drawn as erect arrows.  Real rays are solid lines  Virtual rays (only appear to exist behind the mirror) are dotted lines

21. draw the mirror showing the principal axis, the centre of curvature, and the principal focal point place a vertical arrow on the principal axis to illustrate the position and size of the object draw two rays from the tip of the object arrow to the mirror draw the reflected rays from the mirror the point where the reflected rays meet (real image) or appear to diverge from (virtual image) is the position of the image draw a vertical arrow from the principal axis to the point mentioned above

26.  Workbook p. 226-7 #1- 4 (mirror diagrams only)  Read text p. 656 - 662