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Colors of light (Grade 8)

Light behaves as both a particle and a wave, traveling at approximately 300,000 km/s and demonstrating properties such as refraction and color perception. Key concepts include the bending of light at media boundaries, which affects how objects appear under different conditions, and the role of the human eye in distinguishing colors. The perception of color is influenced by the light reflected by objects, with white light containing all colors and black objects absorbing them.

Education◦
 Behaves like a particle and a wave.  Is a radiant energy, usually referring to electromagnetic radiation that is visible to the human eye.
 Proposed by James Clark Maxwell  He showed that electric and magnetic fields were propagated together and that their speed was identical with the speed of light.
 Travels very fast – around 300, 000 km/s.  Travels very fast in straight lines. Laser
 Light travels much faster than sound. 1) Thunder and lightning start at the same time, but we will see the lightning first. 2) When a starting pistol is fired we see the smoke first and then hear the bang.
 Light exhibit the characteristics and properties of a wave.
Apparent depth -- is the illusion that objects under the water appear to be nearer the surface than they really are. --This is visible when an observer is standing beside the swimming pool looking at an object under water. *This phenomenon is a consequence of the bending of light when light traverses the air-water boundary.
Refraction -- is the bending of light when it travels from one medium to another of different optical densities.
 Is the sluggishness of the atoms of a medium to maintain the absorbed energy before reemitting. * When light crosses the boundary of two media of different optical density, a change in speed takes place. This change in speed is manifested as bending of the light ray.
 Light bends towards the normal when traveling from a less dense medium to a higher density medium.
*is a known indicator of the optical density of a material. * is a quantity that compares the speed of light in that material to its speed in a vacuum.
 The only thing we can see is light.  When the light bounce on object we can understand the color & Texture  The color an object appears depends on the colors of light it reflects.
Rods and Cones in the Retina: red green blue
Color is the perceptual quality of light. The human eye can distinguish almost ten million colors. Color of Objects: o White light is the presence of ALL the colors of the visible spectrum. oBlack objects absorb ALL the colors and no light is reflected back.
*Emission *Reflection *Transmission *Interference *Dispersion *Scattering
 is a special kind of refraction which provided us colors of light.
Colors of light (Grade 8)
Colors of light (Grade 8)
Colors of light (Grade 8)
Colors of light (Grade 8)
Colors of light (Grade 8)