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Tuesday, February 9, 2010

Reflection is the bouncing back of a light ray from a surface.

Law of Reflection

When a light ray is incident upon a reflecting surface, the angle of reflection is equal to the angle of incidence. Both of these angles are measured relative to a normal drawn to the surface. The incident ray, the reflected ray, and the normal all lie in the same plane.

law of reflection

Diffused reflection

When rays are reflected from a rough surface, they are reflected in many directions and no clear image is formed. None of the normals drawn to the surface (at the point at which the incident light ray strikes the surface) are parallel.

Regular reflection

When rays are reflected from a smooth surface, they are reflected so that a clear image is formed. The reflected rays are nearly parallel. The normals drawn to the surface (at the point at which the incident ray strikes the surface) are nearly parallel.

Types of mirrors:

  1. Plane mirrors
    A flat mirror that reflects light rays in the same order as they approach the mirror.
  2. Concave mirrors
    A converging mirror; light rays that strike the mirror surface are reflected so that they converge, or "come together," at a point
  3. Convex mirrors
    A diverging mirror; light rays that strike the mirror surface are reflected so that they diverge, or "go apart," and they never come to a point.

Type of images:

  1. Real images
    formed by converging light rays; can be projected on a screen; orientation=inverted
  2. Virtual images
    formed by diverging light rays; cannot be projected on a screen; orientation=erect

Characteristics of plane mirror images:

  1. Object size = image size
  2. Object distance = image distance
  3. Orientation = erect
  4. Always forms a virtual image
  5. Image is reversed, left to right

Steps for drawing a plane mirror ray diagram:

  1. A ray that strikes perpendicular to the mirror surface, reflects perpendicular to the mirror. This reflected ray is extended behind the mirror

  2. A ray that strikes the mirror at any angle reflects so that the angle of incidence equals the angle of reflection; the reflected ray is extended behind the mirror


    http://peggyschweiger.tripod.com/mirrors.html



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