zhang23

# zhang23 - Mirrors and Lenses Virtual images form at the...

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3/12/2010 1 Mirrors and Lenses Virtual images: form at the point where rays appear to originate (diverge from) - cannot be display on screen Real image : form at the point where rays of light intersect (actually pass through) - can be displayed on screen Virtual image Real image

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3/12/2010 2 Law of reflection, Triangles PQR and P’QR are identical: - object distance = image distance - Lateral magnification M ' ' O I | | q p 1 ' heigh object height image h h M Concepts: Object distance, Image distance, Lateral magnification The image is virtual ; upright (same orientation as the object) The image is behind the mirror: p = |q| The image is unmagnified (h ’ = h and M = 1) There is an apparent left-right reversal in the image Ambulances have “AMBULANCE” written backwards
3/12/2010 3 You are standing in front of a short flat mirror . You can you your head but can’t see your shoes. To see your shoes, you may (1) move closer to the mirror. (2) move further from the mirror. (3) lower the mirror Moving closer does not help! To see feet, bottom of mirror must extend at least as low as midpoint between eyes and feet independent on how far you are from the mirror.

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3/12/2010 4 A spherical mirror: segment of a sphere Concave spherical mirror Convex spherical mirror R: radius of curvature C: center of curvature V: center of the spherical segment Principle axis : A line drawn from C to V V
3/12/2010 5 Consider two rays from the object - one passes through C, reflected back onto itself - the other hits point V and is reflected - The intersect of the reflected rays gives the image point The relationship between object distance p, image distance q and the radius of the mirror R the Mirror Equation The magnification of a concave mirror - if M is negative, image is inverted R q p 2 1 1 p q h h M '

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3/12/2010 6 If an object is very far away, p= and 1/p = 0 In this case, the image point is called the focal point F The distance from the mirror to the
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## This note was uploaded on 03/15/2010 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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zhang23 - Mirrors and Lenses Virtual images form at the...

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