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Reflection Chapter 29 Reflection When a wave encounters a new medium or barrier some of the wave is bounced back (reflected), and some is transmitted (refracted) Simulation Law of Reflection Angle of Incidence = Angle of Reflection θi = θr Always measured from Normal(Perpendicular) θi θr Types of Reflection Regular Reflection Reflection of light from a smooth surface Diffuse Reflection Reflection of light from a rough surface Image Types Real – Light rays actually travel to that location Virtual – Light appears to be at that location Upright – image is right side up compared to object Inverted – image is upside down as compared to object Plane (flat) Mirror Mirror The light we see appears to originate from the other side of the mirror Curved Mirrors Concave Mirrors Can produce real or virtual images Rear View Mirrors on Cars Convex Mirrors Always produce virtual images Image is always smaller Curved Mirrors Portion of a circle Center of Curvature (C) is located at the center of the Circle Focal Length (focal point) (f) is located halfway between the center of curvature and the mirror along the optical axis C f Concave Mirrors Drawing Ray Diagrams Any ray entering through the center of curvature will, after interaction with the optical device (mirror), leave (or appear to leave) through the center of curvature C f Concave Mirrors Drawing Ray Diagrams Any ray entering parallel to the optical axis will, after interaction with the optical device (mirror), leave (or appear to leave) through the focal point C f Concave Mirrors Drawing Ray Diagrams Any ray entering through the focal point will, after interaction with the optical device (mirror), leave (or appear to leave) parallel to the optical axis C f Concave Mirrors C f Convex Mirrors Same Rays as concave f C Mirror Simulation Simulation Mirrors Object distance, do Where the object is located Image distance, di Where the image is located Negative distance is located “inside” mirror, opposite side Mirrors Object size, So Image size, Si Negative means inverted Mirror Equations 1 1 1 f do di Si di M So do M = Magnification