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Chapters_26 - Chapter 26 Image formation by mirrors and...

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1 Chapter 26: Image formation by mirrors and lenses d o d i , 0 i d d - = , 1 0 0 + = - = = d d h h m i i , 1 1 1 f d d i o = + , 2 r f = , 0 0 d d h h m i i - = = , 1 1 1 f d d i o = + , 0 0 d d h h m i i - = = ), 1 1 )( 1 ( 1 2 1 r r n f + - = Image property: (1) (2) ( virtual upright image on the other side ) Outline ---- 1. Image by plane mirror: 2.Image by spherical mirrors: --- image property & mirror equation: (1) concave mirror (2) convex mirror 3. Image by lenses: --- image property & lens equation: (a) converging lens (+) (b) diverging lens (-) (c) lensmaker’s equation: 4. Ability to solve real problems
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2 spherical mirror: Surface reflection and focus length f 2 r f =
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3 Properties for image determination , 1 1 1 f d d i o = + 2) Mirror equation: , 0 0 d d h h m i i - = = , 2 r f = spherical mirror: 1) Three rules for a image diagram: (a) parallel beam (to the mirror axis) must go through the focus F (after reflection). (b) beam through the focus F must be parallel (to the axis after reflection). (c) beam through the center C has no bend (after reflection). image magnification , 0 0 i i d h d h - = , 0 0 f h f d h i - = - , 0 0 d d h h i i - = , 0 0 f d f h h i - - = , 0 0 i d d f f d = -
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4 Concave mirror: a) f > 0 b) image can be any kind and anywhere --- upright ( m > 0) or inverted ( m < 0) , real ( d i > 0 ) or virtual ( d i < 0 ) .
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