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lec17 - Radius of Curvature Last Lecture Plane Mirror A...

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1 Radius of Curvature Last Lecture: Plane Mirror A plane mirror is a spherical mirror with an infinite radius of curvature. O Height = I Height 10/26/10 3 Spherical Mirrors Concave Mirror : (e.g. make up mirror) Convex Mirror: (e.g. surveillance mirror) DEMO 4 Focal Points of Spherical Mirrors DEMO Concave: Parallel rays close to central axis reflect through a common point 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.

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2 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 10/26/10 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). 10/26/10 7 Magnification Size of an object or image is measured to the mirror’s central axis & is called the image height, h i .
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lec17 - Radius of Curvature Last Lecture Plane Mirror A...

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