Chapter 7 physical science

# Chapter 7 physical science - Chapter 7 Light Ray Model of...

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Chapter 7 Light Ray Model of Light The properties of light can be most easily described if light is viewed as moving in rays. Light Ray – a very narrow beam of light that is often represented by an arrow. Your brain always assumes these light rays travel in perfectly straight lines (not always true). How Do We See? In order to see an object light rays have to leave it and enter your eye. Object can be a source of light (light bulb, the Sun) or reflect light from another source (the Moon). In order to see an image, light rays must be focused somehow, usually by a lens or mirror. Properties of Light: Reflection When light strikes an object it can be absorbed, reflected, transmitted, or all of the above. Reflection – the bouncing back of a light wave. Law of Reflection – angle of incidence (angle of the incoming light ray) always equals the angle of reflection (angle of the reflected light ray). Note: all angles are measured from a normal (perpendicular) line. Properties of Light: Reflection Two Types of Reflection Diffuse Reflection – reflection from a rough surface. Light rays are reflected in random directions and no clear image is produced. Regular Reflection – reflection from a very smooth surface. Light rays are all reflected at the same angle and a clear image can be seen. Images in Mirrors Plane (flat) Mirror – light rays seem to be coming from behind the mirror. Image is just as far behind the mirror as the object is in front. Virtual Image – image formed where light rays SEEM to be coming from. Always forms behind a mirror. Is always upright. Cannot be projected onto a screen. Images in Mirrors Curved Mirrors: Convex Mirror – curved outward. Produces reduced virtual images Provides a large field of view Examples: Security mirrors, rearview mirrors Concave Mirror – curved inward. Can produce enlarged virtual images or real images. Example: Make-up mirror Images in Mirrors

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Real Image – image formed where light rays actually meet. Forms in front of the mirror. Is always inverted. Can be projected onto a screen.
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