2. the turning back of an electromagnetic wave at the surface of a substance INCIDENT RAY REFLECTED RAY

3. Line normal to the surface ’’ Angle of incidence =Angle of reflection

4. Smooth flat surface – water, mirror

5. Each light ray follows the law of reflection

6. OBJECT You think light came from back here

7. OBJECT You think light originated here IMAGE

8. OBJECT You think light originated here IMAGE an image formed by light rays that only appear to intersect

16. An inwardly curved, mirrored surface that is a portion of a sphere and that converges incoming light rays Notice that the lines normal to the surface all cross through the “center or curvature”

17. PRINCIPAL AXIS The “focal point” of the lens is ½ of the radius of curvature

18. PRINCIPAL AXIS OBJECT RAY 1 goes in parallel to principal axis comes out through focal point

19. PRINCIPAL AXIS OBJECT RAY 2 goes in through focal point comes out parallel to princ axis

20. PRINCIPAL AXIS OBJECT RAY 3 goes in through center of curv. comes out back along itself

21. PRINCIPAL AXIS OBJECT You think light originated here IMAGE IMAGE IS ERECT ( right side up ) AND MAGNIFIED

22. OBJECT Reflected rays cross here

23. OBJECT an image formed when rays of light actually intersect at a single point Image is inverted

25. 1p1p 1q1q 1f1f + = Object distance from mirror Image distance from mirror Focal length

26. OBJECTIMAGE 1 2 3 4 1p1p 1q1q 1f1f + = Predict location of image 111 + =.8q

27. OBJECTIMAGE 1 2 3 4 1p1p 1q1q 1f1f + = Predict location of image 111 + =.8q1.35 q = -.51 cm Negative means it is on the other side VIRTUAL