# Lec25 - cture 25- cture 25- 1 Locating Images Real images...

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Unformatted text preview: cture 25- cture 25- 1 Locating Images Real images form on the side of a mirror where the objects are, and virtual images form on the opposite side. only using the parallel, focal, and/or radial rays. cture 25- cture 25- 2 Mirror Equation and Magnification ' ' y s m y s = = ' s m s - s is positive if the object is in front of the mirror (real object) s is negative if it is in back of the mirror (virtual object) s is positive if the image is in front of the mirror (real image) s is negative if it is in back of the mirror (virtual image) m is positive if image and object have the same orientation (upright) m is negative if they have opposite orientation (inverted) f and r are positive if center of curvature in front of mirror (concave) f and r are negative if it is in back of the mirror (convex) 1 1 1 ' s s f + = ( f = r/2 ) cture 25- cture 25- 3 Demo 7A10 DOCCAM 2 7A-10 F and 2F Mirror 1/s + 1/s = 1/f magnification m m = - s / s s object distance s image distance f focal length f > 0 concave mirror f < 0 convex mirror cture 25- cture 25- 4 READING QUIZ 1 Which of the following statements is incorrect ? The statements describe the optical characteristics of the human eye. A| A near sighted eye focuses in front of the retina when observing an object located at infinity. B| A far sighted eye focuses behind the retina when observing an object located at infinity. C| A converging lens is used to correct the vision of a near sighted eye. D| Astigmatism is a condition where the eye does not have cylindrical symmetry about the central optical axis. E| A cataract operation of the second lens inside the eye removes the clouded lens and replaces it with a plastic implant. cture 25- cture 25- 5 s S Refracting Surface Formula 1 1 2 2 1 1 2 2 sin sin n n n n = 1 2 1 2 2 1 , ( ) n n n n = + = + + =- A point object O is placed on the central axis of a convex refracting surface. The center of curvature of the surface is at C . It is easy to see (for small angles) Derivation: 1 2 2 1 , ' , ' ac ac ac n n n s r n s s r s - + = = ) ) ) But Setting for parallel rays, the focal length...
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## This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue University-West Lafayette.

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Lec25 - cture 25- cture 25- 1 Locating Images Real images...

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