1. 18.1 Mirrors Katie Hanna

2. Mirrors  Mirrors are the oldest optical instruments.  Prehistoric humans saw their faces reflected in the quiet water of lakes or ponds.  Almost 4,000 years ago, Egyptians used polished metal mirrors to view their images. Hall of Mirrors Versailles. N.d. Visiting DC. Web. 1 Mar. 2011..

3. Jean Foucault  Sharp, well-defined reflected images were not possible until 1857, when Jean Foucault, a French scientist, developed a method of coating glass with silver. Jean Foucault. N.d. Knowledge Rush. Web. 1 Mar. 2011..

4. Objects and Images in Plane Mirrors

5. Plane Mirrors  A flat, smooth surface from which light is reflected by regular reflection rather than by diffuse reflection.  Bathroom Mirrors.  Regular Reflection. Plane Mirror. N.d. EdInformatics. EdInformatics Org., n.d. Web. 1 Mar. 2011..

6. Objects  A source of spreading, or diverging light rays.  Every point on an object is a source of diverging light rays.  Anything reflected in a mirror. Object in a Mirror. N.d. Physics Problems to Challenge Understanding. Donald Simanek, n.d. Web. 1 Mar. 2011..

7. Images  An image is a reproduction of an image formed with mirrors or lenses.  The reflected image of an object. Image in a Mirror. N.d. Physics 20. Physics, n.d. Web. 2 Mar. 2011..

8. Virtual Images  A reflection in a normal mirror is actually a virtual image because the light rays do not actually converge on that point. Virtual Image. N.d. SMU Physics and Astronomy Demonstrations. SMU, n.d. Web. 2 Mar. 2011. <http://www.ap.smu.ca/demos/ index.php?option=com_content view=article&id=122&Itemid=85

9. Erect Image  If the image and object are pointing in the same direction as each other, it is an erect image.

10. More Help  Mirrors Explained Mirrors Explained Mirrors Explained  http://library.thinkquest.org/27356/p_mirror s.htm  http://www.pa.msu.edu/courses/2000fall/P HY232/lectures/lenses/images.html  http://www.physicsclassroom.com/class/re fln/u13l4a.cfm

11. Concave Mirrors

12. Concave Mirror  A concave mirror reflects light from its inner (“caved in”) surface.  Makeup mirror, Inside of a spoon Spoon. N.d. Smooth Harold. Blake Snow, n.d. Web. 2 Mar. 2011..

13. Concave Mirror Image formation by a concave mirror. N.d. Spherical Mirrors. Richard Fitzpatrick, n.d. Web. 2 Mar. 2011..

14. Spherical Concave Mirror  In a spherical concave mirror, the mirror is part of the inner surface of a hollow sphere. Spherical aberration in a concave mirror. N.d. Spherical Mirrors. Richard Fitzpatrick, n.d. Web. 2 Mar. 2011..

15. Principal Axis  The principal axis is the straight line perpendicular to the surface of a mirror at its center.

16. Focal Point  The focal point is the point on a mirror where parallel rays meet. Focal point. N.d. Pirates and Revolutionaries. N.p., n.d. Web. 2 Mar. 2011..

17. Focal Length  The focal length is the distance from the focal point to the mirror along the principal axis.

18. Real Image  A real image is an image that rays actually converge and pass through.  Can be seen on a piece of paper or projected onto a screen.

19. Lens/Mirror Equation  You can use geometry to relate the focal length of the mirror, f, to the distance from the object to the mirror, d o, and to the distance from the image to the mirror, d i. Lens/Mirror Equation. N.d. Online Physics Lab. PhysicsLAB, n.d. Web. 3 Mar. 2011..

20. How to Solve the Equation  To solve the equation:  Use the least common denominator, d i d o.  Take the reciprocal of both sides. Lens/Mirror Equation 2. N.d. Online Physics Lab. PhysicsLAB, n.d. Web. 3 Mar. 2011..

21. Magnification  Magnification, m, is the ratio of the size of the image, h i, to the size of the object, h o. m = Magnification Equation. N.d. Physics Study Guide. N.p., n.d. Web. 3 Mar. 2011..

22. Spherical Aberration  The image formed by parallel rays in a large spherical mirror is a disk, not a point. This effect is called spherical aberration.  A parabolic mirror has no spherical aberration because all parallel rays are reflected to a single spot. Spherical Aberration. N.d. Refracting vs Reflecting. N.p., n.d. Web. 3 Mar. 2011..

23. Convex Mirrors

24. AAAA convex mirror is a spherical mirror that reflects light from its outer surface. WWWWide-angle mirrors for safety and security. A Wide Angle Photo Of A Wide Angle Mirror Through A Wide Angle Mirror. N.d. Flickr. Yahoo! Inc., n.d. Web. 2 Mar. 2011..

25. Works Cited  Colwell, Catharine H., comp. "Mirror Equation.“ Online Physics Lab. PhysicsLAB, n.d. Web. 26 Feb. 2011..  Kirkland, Kyle, and Sean M. Grady. "mirrors and lenses in optics." Science Online. Facts On File, Inc. Web. 25 Feb. 2011..  Zitzewitz, Paul W. Physics Principles and Problems. New York: Glencoe, 2002. Print.