# The color of light depends on its wavelength or if

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The color of light depends on its wavelength (or if you prefer – on its frequency). Red light has the longest wavelength (and the smallest frequency), and violet light has the shortest wavelength (and the largest frequency). White light contains light waves of all wavelengths. If the wavelength of an electromagnetic wave becomes greater than 7.5 × 10 -7 meters or less than 3.8 × 10 -7 meters, our eyes can no longer see it. In a vacuum all electromagnetic waves travel at the speed of light (3.0 × 10 8 m/s). Electromagnetic radiation is generated whenever electric charges are accelerated. For example, radio waves are produced when electrons are oscillated back and forth in an antenna. Color of an Object An object can absorb light, transmit it and/or reflect it (and/or emit it). How light interacts with a particular material can depend on its frequency. Some materials absorb light of one color and reflect light of another color. When our eyes see a blue shirt, this is because the shirt reflects blue light and absorbs all other colors. A yellow banana appears yellow because it reflects the two primary colors red and green and absorbs blue light.

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Lab Activity Note: The triangular mirror includes the plane mirror, the concave mirror and the convex mirror. Reflection Plane Mirror 1. Place the triangular mirror on top of the shape as indicated. 2. Use the light mask to select a single ray of light . This ray will be the incident ray. 3. Place the light source such that the incident ray on the lens coincides with the “SINGLE RAY” indicated in Figure. 4. Draw the reflected ray (don’t forget to put arrowheads on all your rays). 5. Use a dashed line to indicate the normal line. 6. Label the Angle of Incidence and the Angle of Reflection. 7. Measure and record the Angle of Incidence and Angle of Reflection.
• Fall '19
• Light, Behavior of light

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