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18.1 Mirrors Katie Hanna. Mirrors  Mirrors are the oldest optical instruments.  Prehistoric humans saw their faces reflected in the quiet water of lakes.

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Presentation on theme: "18.1 Mirrors Katie Hanna. Mirrors  Mirrors are the oldest optical instruments.  Prehistoric humans saw their faces reflected in the quiet water of lakes."— Presentation transcript:

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. { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/13/3858517/slides/slide_8.jpg", "name": "Virtual Images  A reflection in a normal mirror is actually a virtual image because the light rays do not actually converge on that point.", "description": "Virtual Image. N.d. SMU Physics and Astronomy Demonstrations. SMU, n.d. Web. 2 Mar. 2011.

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.


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