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Science 8 Chapter 11

Science 8 Chapter 11. 11.2: Reflecting Light off Surfaces. Specular Reflection. The reflection of light off a smooth, shiny surface. Laws of Reflection. The incident ray, the reflected ray, and the normal all lie in the same plane .

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Science 8 Chapter 11

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  1. Science 8 Chapter 11 11.2: Reflecting Light off Surfaces

  2. Specular Reflection • The reflection of light off a smooth, shiny surface

  3. Laws of Reflection • The incident ray, the reflected ray, and the normal all lie in the same plane. • The angle of incidence equals the angle of reflection.

  4. Diffuse Reflection • Occurs when light hits an irregular surface

  5. 11.3 Describing images

  6. Optical Device • Produces an image OF an object

  7. There are two types of images created from an optical device • Virtual and • Real images

  8. Virtual image: • an image in which the outgoing rays from a point on the object always diverge (spread apart). • It will appear to converge in or behind the optical device (i.e., a mirror). • A simple example is a flat/plane mirror where the image of oneself is perceived at twice the distance from oneself to the mirror. • That is, if one is half a meter in front of the mirror, one's image will appear to be at a distance of 1 meter away (or half a meter inside or behind the mirror). • Because the rays never really converge, one cannot project a virtual image onto a screen.

  9. Real Image: • a representation of an object (source) in which the perceived location is actually a point of convergence (come together at a point) of the rays of light that make up the image. • If a screen is placed in the plane of a real image the image will generally become visible on the opaque screen. • Examples of real images include: • the image seen on a cinema screen (the source being the projector), • the image produced on a detector in the rear of a camera, • and the image produced on an eyeball retina (the camera and eye focus light through an internal convex lens). • A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to converge.

  10. http://www.youtube.com/watch?v=zNqXtzTcIqE

  11. Characteristics of images • Size (ex) image is smaller than original object) • Attitude (upright or inverted) • Location of image (ex.) behind the mirror • Type (virtual or real)

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