Chapter 23 Light: Geometric Optics
Reflection When a wave reaches a boundary between two media and is turned back – this is reflection Total reflection –boundary with a more rigid medium Partial reflection – less rigid medium. This can be analyzed using the ray model of light, i.e. representing a light wave with a ray.
Law of Reflection The law of reflection states that the angle of incidence = angle of reflection Incident ray Reflected ray Angle of incidence Angle of reflection
Mirrors Plane mirrors are flat mirrors which form a virtual image. A virtual image is one which forms on the opposite side of the mirror. Images are the same size as the object and the same vertical orientation.
Image in a Plane Mirror Seeing yourself in a plane mirror requires that the mirror be at least ½ the height of the object You see your head looking straight across You see your feet looking down, since the ray passes through the mirror at ½ the distance between you and the image so the mirror, by similar triangles must be ½ your height.
Curved Mirrors Vocabulary
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