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Mirrors

The Reflection of Light: Mirrors

QuestionAnswer
Wave fronts Surfaces that are through all points of the wave that are in the same phase of motion
Rays Radial lines pointing outward from the source and perpendicular to the wave fronts
Plane Waves Waves whose wave fronts are flat surfaces
Rays are_____ to wave fronts; therefore, rays for the plane wave are ________ to each other Perpindicular; parallel
Angle of Incidence Angle that the incident rays make with respect to the normal
Normal Line drawn perpindicular to the surface at the point of incidence
Angle of Reflection Angle that the reflected ray makes with the normal
Angle of Reflection is _______ to Angle of Incidence Equal
Specular Reflection Reflected light rays are parallel to each other when parallel light rays strike a smooth surface
Diffuse Reflection Reflected light rays point in various directions when light rays strike an irregular suface
real image light rays actually emanate from the image
vitrual None of the light rays actuall emanate from the image
3 properties of a plane mirror when you are looking at yourself in the mirror Image is upright, same size as you are, and located as far behind the mirror as you are in front of it
Concave Converging mirror- Inside surface of the mirror is polished
Converging Mirror Concave Mirror
Convex Mirror Diverging Mirror- outside surface of mirror is polished
Diverging Mirror Convex Mirror
Principal Axis Straight Line drawn through C (center of curvature)and the midpoint of the mirror
Image point point where rays are near the principal axis and cross it a common point after reflection. The rays continue to diverge from this point as if there were an onbject there The image is a real image.
focal point An image is infinitely far from the mirror, making the rays parallel to the principal axis as they approach the mirror, they reflect from the mirror and pass through an image point which in this special case is called a focal point
focal length distance between focal point and middle of the mirror
focal length formula f= 1/2R
paraaxial rays rays that lie close to the principal axis
spherical abberation the fact that a spherical does not bring all rays parallel to the principal axis
Mirror Equation for Concave Mirror 1/f= 1/di+1/do (di can be negative if it is a vrtual image- this can happen when an object is between the focal point and the mirror
Magnification equation for Concave Mirror Ratio of the image height to the object height
Magnif equa for Concave Mirror m= hi/ho = -di/do
Sign for focal length in a concave mirror +
gth in a convex mirror -
If Object is in front of the mirror use a _____ sign Positive. It is a real object
If Object is behind the mirror use a _____ sign Negative. It is a virtual object
Image distance is _____ if the image is in front of the mirror Positive. It is a real image
Image distance is _____ if the image is behind of the mirror Negative. It is a virtual image
If image is upright with respect to the object the magnification is ___________ positive
If image is inverted with respect to the obect magnification is _______ negative
Created by: alli725 on 2006-03-15



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