MY SO Waves Notes Powerpoint - Visible Light.pptx

MY SO Waves Notes Powerpoint - Visible Light.pptx

• 1.
  Visible Light MY SOWaves Notes Part 3
• 2.
  Visible Light The partof the electromagnetic spectrum, between infrared and ultraviolet, that is visible to the human eye. Shorter waves - higher frequencies and energy. Longer waves - lower frequencies and energy.
• 3.
  Visible Light Spectrum Producedwhen light passes through a prism, slowing the wavelength into each separate color. ROY G. BIV - red, orange, yellow, green, blue, indigo, violet
• 4.
  Colors We see thesewaves as the colors of the rainbow. Each color has a different wavelength and frequency. Red has teh longest wavelength and the shortest frequency. Violet has the shortest wavelength and the highest frequency. Seen together, they make white light.
• 5.
  Visible Objects For anobject to be visible it must produce its own light or reflect light. Produces own light - Sun candle, flashlight Reflects light - Moon, mirror, glass
• 6.
  Vocabulary Opaque - Amaterial that reflects or absorbs all of the light that strikes it Examples: wood, metal, cardboard Transparent - transmits light Examples: Glass, water, air Translucent - scatters light as the light passes through Examples: Wax paper, frosted glass
• 7.
  Visible Light Light travelsin straight lines. This straight line motion can be: Reflected Diffused Refracted Absorbed
• 8.
  Reflection Occurs when parallelrays of light hit a smooth surface. All the rays are reflected at the same angle. Law of reflection: The angle of reflection, equals the angle of incidence. Angle of incidence: measure of the angle of a ray to the the surface normal (90 degrees to the surface)
• 9.
  Diffusion When parallel raysof light hit a bumpy surface. Each ray obeys the law of reflection, but each ray hits the surface at a different angle. The light is scattered.
• 10.
  Refraction When light wavesenter a new medium at an angle, their speed changes. The change in speed causes them to bend, or change direction. Index of Refraction - a measure of how much a ray of light bends when it enters that material.
• 11.
  Visible Light When lighttraveling in straight, parellel lines pases through an object that is curved like a lens, the light is refracted at different angles Convex, or converging, lenses bend light toward a central focal point. Concave, or diverging, lenses bend light outward away from a focal point..
• 12.
  Absorption Light does notpass through or reflect from material, but remains in the material as energy.
• 13.
  Color of objects Objectsreflect colored light that is not absorbed. We see an object’s color as the reflected color.
• 14.
  Colors of Light- Primary Red, Blue, and Green When combined in equal amounts, primary colors produce white light. If combined in varying amounts, they can produce any other color.
• 15.
  Colors of Light- Secondary Yellow, Cyan, and Magenta Primary colors combined in varying amounts Complementary - form when a primary color and a secondary color combine to make white. Yellow and blue = white
• 16.
  Brightness A relative expressionof the intensity of the energy output of a visible light source. Brightness is determined by the light wave’s amplitude. The greater the amplitude, the brighter the light. Distance from light source also affects brightness.