Chapter 34 - Images.pptx - Chapter 34 – Images Optics Physics 142 Daniel Allen Images • Goal of physics/engineering – Understand the laws of light

Chapter 34 - Images.pptx - Chapter 34 – Images Optics...

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Chapter 34 – Images & Optics Physics 142 Daniel Allen
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Images Goal of physics/engineering Understand the laws of light Law of reflection Law of refraction Applications – Production of images Many industries and research rely on images TV, computers, entertainment Military satellites Surveillance systems Astronomy Medicine Etc.
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Images Image – a reproduction derived from light 2 kinds Real image – can be formed on a screen Virtual image – exist in the brain and perceived at a location Water mirage on the road Virtual image
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Plane Mirrors Plane mirrors are flat reflecting surfaces Eyes perceive a virtual image behind the mirror Rays don’t pass through it
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Plane Mirrors Image the same distance away as the object Where i = image distance (-, virtual), p = object distance (+) Use plane mirrors to construct a mirror maze
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Spherical Mirrors Mirrors with curved surfaces Changes image produced and its characteristics 2 types Concave – ‘caved in’ Convex – flexed outward
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Spherical Mirrors Concave Center of curvature, C, in front Field of view decreased i > p image farther than object Image height greater (magnified) Shaving or makeup mirror Convex C behind Field of view increased Images move closer Image shrinks Surveillance mirrors in stores
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Focal Point Real focal point – f + Virtual focal point – f -
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Focal Point f related to radius of curvature, r Where r is + for concave and r is – for convex
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Images from Spherical Mirrors
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Images from Spherical Mirrors
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Images from Spherical Mirrors
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Images from Spherical Mirrors Real images – form on the same side as the object
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