1. Mirrors Plane and Spherical

2. Plane Mirrors Flat mirrors. Which type of image? Virtual We perceive the image at point I where the ray extensions intersect

3. Clifton Bluhm Real Penny Image of Penny

7. http://www.throwlikeagirl.net/archives/000040.html http://www.waitingtimetoys.com/wallmodels.2/fun.mirror.html Curved Mirrors

8. Curved Reflectors

9. Principle Axis Focal Point Focal Length (cm)

10. http://www.atnf.csiro.au/news/press/images/urumqi/urumqi_25m_telescope.jpg

11. http://www.windows.ucar.edu/earth/images/arecibo.jpg Diameter = 305 m (1000 ft) Built = 1963 Location = Puerto Rico Arecibo Radio Telescope

13. Focal Length of a Spherical Mirror R – Radius of Curvature

14. Ray Tracing We will predict the image that will be formed by a mirror or lens using ray tracing. We typically care about three ‘special’ rays: 1.Two rays that go through the focal points 2.The ray that go through the center of the object

15. Spherical Mirrors and Ray Tracing The focal point of a concave mirror The focal point of a convex mirror Slide 18-32

16. Three Sets of Special Rays for a Concave Mirror Slide 18-33

17. A Real Image Formed by a Concave Mirror Slide 18-34

18. Slide 18-35

19. Three Sets of Special Rays for a Convex Mirror Slide 18-36

20. Ray Tracing for a Convex Mirror Slide 18-37

21. Images and Mirrors Real images will form on the side of the mirror where the object is located Virtual images will form on the opposite side

22. The Thin-Lens Equation – This works for both mirrors and lenses Thin-lens equation (also works for mirrors) relating object and image distance to focal length Slide 19-10

23. Sign Conventions for Lenses and Mirrors Slide 19-11

24. Magnification Slide 18-26 A random place for this slide but it needs to go somewhere. The next slide shows the different values from this equation.

25. Ray Tracing: Virtual Images Slide 18-27

26. Sample Problem A convex mirror has a focal length of -10 cm. An object of 4 cm high is placed 20 cm in front of the mirror. 1.Find the position and size of the image. 2.Describe the nature of the image.