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11.4 Ray Model of Light Remember... Light travels in straight lines YOU WILL NEVER SEE A FLASHLIGHT BEAM GO AROUND A CORNER! A candle radiates light in all directions A LIGHT RAY is a line on a diagram representing the direction and path that light is traveling. Incident Light: light emitted from a source that strikes an object • Matter can be classified into three categories depending on how it behaves when light strikes it Term Transmission of Incident Light Transparent All light transmitted Clarity of Object through material Example The Ray Model of Light Translucent Some light transmitted, some absorbed or reflected Opaque No light transmitted, all absorbed or reflected Term Transmission of Incident Light Clarity of Object Example through material Transparent All light transmitted Object is seen clearly Translucent Some light transmitted, some absorbed or reflected Object is seen, but not clearly No light transmitted, all absorbed or reflected Object is not seen at all The Ray Model of Light Opaque Term Transmission of Incident Light Clarity of Object through material Example Transparent All light transmitted Object is seen clearly Clear glass Translucent Some light transmitted, some absorbed or reflected Object is seen, but Frosted not clearly glass Opaque No light transmitted, all absorbed or reflected Object is not seen at all The Ray Model of Light Cardboard Flat Mirrors IMAGE: reproduction of an object that is produced through the use of light REFLECTION: the bouncing back of light from a surface “Mirror, mirror on the wall, who’s the fairest one of all?” A PLANE MIRROR ILLUSTRATES HOW PREDICTABLE THE PATH OF LIGHT IS WHEN IT HITS A MIRROR. Plane mirror or flat mirror: flat, polished surface that reflects an image INCIDENT RAY ...The original incoming ray of light REFLECTED RAY ...The ray that bounces off the mirror ...THE DOTTED LINE THAT IS PERPENDICULAR, OR AT RIGHT ANGLES, TO THE REFLECTING MIRROR SURFACE “Normal line” is perpendicular (90) to the surface ANGLE OF INCIDENCE ANGLE OF REFLECTION When light hits an object, it can be… Transmitted- pass through the object Refracted- light bends as it is absorbed by the object Reflected- light is scattered away from the object p.481 # 3 & 5 Check your answers! 3. Transparent Translucent Opaque clean glass frosted glass textbook clean air thin tissue paper rock apple juice sunglasses 5. The normal is a line that is perpendicular to a surface (i.e. 90oC), touching the surface at the point where a light ray strikes. The angle of incidence is the angle between the incoming ray and the normal. The angle of reflection is the angle between the reflected ray and the normal.