Lecture 35 - Plane surfaces. Spherical mirrors

# Lecture 35 - Plane surfaces. Spherical mirrors - Image on a...

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1 Lecture 35 Plane surfaces. Spherical mirrors. Image on a plane mirror All the reflected rays seem to be coming from here! Virtual image (no real light gets there) As explained in lecture 33: How to find the image • Draw two rays (one of them the normal to the surface, it ` s a trivial one) • Draw reflected rays. • Extrapolate rays until they intersect. s s ` : location of the object : location of the image Positive in front of mirror Negative behind mirror Plane mirror: = -s Sign conventions Position of object : > 0 if object is on the same side of surface as incoming rays Position of image : ` > 0 if image is on the same side of surface as outgoing rays Radius of curvature : R > 0 if center of curvature is on the same side of surface as outgoing rays

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2 Magnification y Object ` s height Both y and ` can be negative if item is upside down! Magnification m = If > 0, image is upright . If < 0, image is inverted. Example: For a plane mirror, m = +1 ` Image ` s height Reverse image A B C A ` B ` C ` Image on a plane mirror is virtual, upright and reversed.
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## This note was uploaded on 09/21/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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Lecture 35 - Plane surfaces. Spherical mirrors - Image on a...

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