Ch31 - Chapter 31: Images and Optical Instruments...

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Chapter 31: Images and Optical Instruments Reflection at a plane surface ± Image formation The reflected rays entering eyes look as though they had come from image P’. P P’ Light rays radiate from a point object at P in all directions. virtual image
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Reflection and refraction at a plane surface ± Image formation
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Reflection and refraction at a plane surface i (or s’) is the image distance s is the object distance: |s| =|i| ± Image formation Sign Rules: (1) Sign rule for the object distance: When object is on the same side of the reflecting or refracting surface as the incoming light, the object distance s is positive. Otherwise it is negative. (2) Sign rule for the image distance: When image is on the same side of the reflecting or refracting surface as the outgoing light, the image distance i ( or s’) is positive. Otherwise it is negative. (3) Sign rule for the radius of curvature of a spherical surface: When the center of curvature C is on the same side as the outgoing light, the radius of the curvature is positive. Otherwise it is negative. s’
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Reflection at a plane surface ± Image formation Multiple image due to multiple Reflection by two mirrors h h’ m = h’/h=1 lateral magnification image is erect image is virtual
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Reflection at a plane surface ± Image formation When a flat mirror is rotated, how much is the image rotated?
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Reflection at a spherical mirror ± Concave and convex mirror
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Reflection at a spherical mirror ± Focal points at concave and convex mirror Focal point or focus: Point F at which rays from a source point are brought together (focused) to form an image. Focal length: Distance f from mirror where focus occurs. f=R/2 where R is the radius of a spherical mirror.
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Reflection at a spherical mirror ± Focal points at a concave mirror α γ δ β + = + = 2 = + h ) /( tan ) ' /( tan ) /( tan d R h d s h d s h = = = d R h s s d if s h s h / ' , ' / / = << = = f R s s 1 2 ' 1 1 = = + object image If 2 / ' , R s s = = s’
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Reflection at a spherical mirror ± Image of an extended object at a concave mirror real image Principle rays: Light rays that can be traced (more easily) from the source
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This note was uploaded on 05/28/2011 for the course PHY 126 taught by Professor Staff during the Summer '08 term at SUNY Stony Brook.

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Ch31 - Chapter 31: Images and Optical Instruments...

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