# lec17 - Radius of Curvature Plane Mirror A plane mirror is...

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Plane Mirror A plane mirror is a spherical mirror with an infinite radius of curvature. O Height = I Height
10/25/11 3 Spherical Mirrors Concave Mirror : (e.g. make up mirror) Center of curvature is in front of mirror Field of view is smaller than for plane mirror Object Height < Image Height Convex Mirror: (e.g. surveillance mirror) Center of curvature is behind mirror Field of view is larger than for plane mirror Object Height > Image Height DEMO

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4 Focal Points of Spherical Mirrors DEMO Concave: Parallel rays close to central axis reflect through a common point F. F is called the focal point. f is the focal length (distance from center of mirror to F). Convex: The extensions of the reflected rays pass through a common point behind the mirror. Sign Convention: r & f are positive for concave mirror. r & f are negative for convex mirror. 2 R f =
5 Images from Spherical Mirrors (b) O at the focal point: *image is ambiguous *rays do not cross to form image (a) O is inside the focal point: *image appears behind the mirror *S i is negative *virtual image *same orientation (c) O is outside the focal point: *image is inverted & in front of the mirror *S i is positive *real image DEMO

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10/25/11 6 Spherical Mirrors • S o > 0 • Real images form on the same side of a mirror as the object (S i > 0). • Virtual images form on the opposite side (S i < 0).
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## lec17 - Radius of Curvature Plane Mirror A plane mirror is...

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