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Transcript
LIGHT REFLECTION Ray Model of Light light is represented as straight lines called rays ray diagrams are drawings that show the path that light takes after it leaves its source light travels in straight lines until it strikes something some materials absorb light and other materials reflect light Regular Reflection light rays that strike a smooth surface they reflect light in the same direction staying parallel to one another it is possible to see an image in the reflection (ex. mirror) Diffuse Reflection light rays that strike a rough/uneven surface they do not remain parallel, but are scattered in different directions an image cannot be seen, but it still reflects light Diagram: smooth, shiny surfaces (ex. mirrors, glass) allow you to see an image image – a reproduction of an object produced by an optical device (mirror) light rays bounce off a mirror Law of Reflection: When light reflects off a surface, the angle of incidence (θi) is always equal to the angle of reflection (θr). Mathematical Equation: (θi) = (θr) Ray Diagram: Reflection of a single ray of light in a ray diagram. Normal – a dashed line drawn perpendicular to the mirror at the point of reflection (an imaginary line) Incident Ray – incoming ray of light Reflected Ray – ray of light that bounces off an object Angle of Incidence (θi) – angle between the incident ray and the normal Angle of Reflection (θr) – angle between the reflected ray and the normal Plane Mirrors is any mirror that has a flat reflective surface when you look in a plane mirror your image appears to be as far behind the mirror as you are in front of it your image in a plane mirror is a virtual image virtual image – any image formed by rays that do not come from the location of the image (if you place a screen behind the mirror at the location of the image, you will not be able to see the image on the screen) real image – light rays that create a real image actually meet each other (can be placed on a screen) a mirror image is not an exact copy of the object it is reflecting – it is a reverse of the image Using Ray Diagrams to Predict the Images in Plane Mirrors 1. From the top of the object, draw two incident rays toward the mirror 2. Draw normals (point where incident ray hits) and reflected rays (same angle as incident rays) 3. Use a similar procedure for the bottom of the object 4. To draw the image, you must make the reflected rays meet. You must therefore extend them (with broken lines) behind the mirror. Where the reflected rays appear to come from is the location of the image Usually the image distance equals the object distance Diagram: 4 Characteristics of an Image Size – is the image bigger, smaller, or the same size as the object? Attitude – is the image upright (same way up) or inverted (upside down)? Location – is the image in front of the mirror or behind it? Type – is the image real or virtual? p. 481 #3-5 p. 486 #1-5 p. 493 # 2,3,5,6,7,11