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Interactions of light waves

Interactions of light waves. January 28, 2014. Why do cats eyes glow in the dark?. Cats have an extra layer of cells on the back of their eyes that reflects the light more through the eye The light that we see with our eyes is only the light that is reflected off an object

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Interactions of light waves

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  1. Interactions of light waves January 28, 2014

  2. Why do cats eyes glow in the dark? • Cats have an extra layer of cells on the back of their eyes that reflects the light more through the eye • The light that we see with our eyes is only the light that is reflected off an object • Reflection – occurs when light waves bounce off an object. The image you see in the mirror has been reflected twice (once from you, again off the mirror)

  3. Law of reflection – The angle of incidence (arrival) is equal to the angle of reflection (departure)

  4. 2 types of reflection • 1. Regular – follows the law of reflection • 2. Diffuse – light reflects at different angles • Ex. Why you don’t see your reflection on walls

  5. What is the difference between a light source and a reflection? • Light sources can be seen in the dark, reflections can not. • Ex. • Moon? • Light bulb? • Flashlight?

  6. Why do objects closer to lights appear brighter than those farther away? • As light travels, it scatters (goes in many directions) as it scatters it gets weaker or less bright • Whenever light is shown on an object, the light is absorbed • Whenever light is bent it is called scattered • Certain wavelengths are scattered more than others so the visible light colors are seen

  7. Why do objects appear different in water? • Results of refraction – bending of light waves as the wave passes between 2 substances in which the speed of the wave differs • How can this be useful? • Eyeglasses which use lenses in which light bends • Concave (thinner in the middle) • Convex (thicker in the middle)

  8. How are rainbows made? • White light from the sun is refracted (bent) through water droplets to produce the color spectrum • The amount they are refracted is dependent on their wavelengths

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