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Mirrors
The Reflection of Light: Mirrors
| Question | Answer |
|---|---|
| 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
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