Lecture 16 - Mirrors (Ch. 26.1-26.2)

Lecture 16 - Mirrors (Ch. 26.1-26.2) - Lecture 16 Ch 26,...

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Lecture 16 Ch 26, Image Formation, Lenses
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Images o An image occurs when light rays from an object diverge (or appear to diverge) from a place other than the object’s location o Imaging problems are most easily solved by drawing a picture + applying formulae p: object distance q: image distance
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Ray Diagrams o Ray diagrams are extremely useful for analyzing images o Ray diagrams are based on the idea that each point on an object emits (or reflects) light in all directions o We choose a small number of rays and trace them. o Image : The point from which rays diverge (or appear to diverge). o Rays must obey the laws of reflection and refraction (we choose certain rays to trace which make it easy to guarantee this)
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o An image may be “real” or “virtual” o A virtual image is formed when light rays appear to diverge from the image location e.g. image in a flat mirror o A real image is formed when light rays actually do diverge from the image location e.g. if you put a screen where the image is located, the image is projected onto the screen A virtual image of O
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Flat Mirrors Solve: Draw two rays from the object point (P) o After reflection these rays appear to originate from point P’ o For a flat mirror : the image is the same size as the object.
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Magnification o The magnification of an image indicates whether the image is larger or smaller than the object itself M= 1 if image is same size M > 1 if image is larger M < 1 if image is smaller M is negative if image is inverted M = 1 for a flat mirror
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Flat Mirror Images o Images formed by flat mirrors have a number of common features: Image is always upright (M > 0) Image is always behind mirror (q > 0, “virtual”) Image is always the same distance from mirror as object (p = |q|) Image is always the same size as object (M=+1)
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Concave/Convex Mirrors o Curved reflecting surfaces can be either concave or convex o A mirror is concave if
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Lecture 16 - Mirrors (Ch. 26.1-26.2) - Lecture 16 Ch 26,...

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