# Shared Flashcard Set

## Details

Chapter 23
optics
32
Physics
04/29/2008

Term
 optics
Definition
 the study of how light behaves
Term
 light ray
Definition
 an imaginary line that represents a thin beam of light
Term
 converging lens (convex lens)
Definition
 bends light so that the light rays come together too point
Term
 diverging lens (concaue lens)
Definition
Term
 Prism
Definition
 another optical device(made up of solid piece of glass with flat polished surfaces)
Term
 Translucent
Definition
 materials that allow light to pass through
Term
 Specular   reflection
Definition
 this type of reflection is: a ray of light that strikes a shiny surface (like a mirror) creates a single reflected ray
Term
 Diffuse reflection
Definition
 A surface that is not shiny creates thisA single ray of light scatters into many directions
Term
 Reflected ray
Definition
 the light ray that bounces off the mirror
Term
 incident ray
Definition
 the light ray that strikes the mirror
Term
 Normal line
Definition
 line between incident and reflected rays an imaginary line that is perpendicular to the surface of the mirror
Term
 angle of incidence
Definition
 the angle between the incident ray and the normal line
Term
 angle of reflection
Definition
 the angle between the normal line and the reflected ray
Term
 law of reflection
Definition
 the angle of incidence equals the angle of reflection
Term
 Ray Diagram
Definition
 An accurately drawn sketch showing how light rays interact with mirrors, lenses, and other optical devices
Term
 Index of refraction
Definition
 The_____for a material measures the ability of the material to bend light
Term
 Angle of refraction
Definition
 is the angle between the refracted ray and normal line
Term
 Total internal reflection
Definition
 As the angle of incidence increases, there is a point at which the light will not enter the air but reflect back into water
Term
 Critical angle
Definition
 The angle of incidence at which the angle of refractgion is 90 degrees
Term
 Fiber optics
Definition
 Are thin glass fibers and use total internal reflection to carry light, even around bends and corners.
Term
 Dispersion
Definition
 descibes how refractive index varies depending on the color of light
Term
 Objects
Definition
 are real physical things that gice off or reflect light rays
Term
 Images
Definition
 are pictures of objects that are formed in space where light rays meet
Term
 Virtual image
Definition
 the image in a mirroris called ____ because the light rays do not actually come together to form the image
Term
 Axis
Definition
 an imaginary line that goes throu the center of the lens
Term
 Focal point
Definition
 Light rays that enter a converging lens parallel to its axis bend to meet at a point called____
Term
 Focal length
Definition
 The distance from the center of the lens to the focal point
Term
 Steps to drawing a ray diagram for converging lens(drawing all 3 together)
Definition
 1. Draw a light ray passing throught the center of the lens2. Darw a light ray that starts parallel to the axis and bends at the lens to pass thorugh the far focal point3. Draw a light ray passing thorugh the near focal point. This light ray bends so it is parallel to the axis on the far side of the lens.
Term
 Real image
Definition
 a converging lens can form___. in_____ light from each single point on an object comes back together again at a single point in another place to make an image
Term
 Focus
Definition
 the place where the light comes back together again
Term
 Magnification
Definition
 of an object is the ratio of the size of the image divided by size of the object
Term
 Refracting telescope
Definition
 Has two converging lenses with different focal lenghts
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