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The Interaction of Light and Matter

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Reflection and Refraction of Light. 11-12. The Interaction of Light and Matter. Absorption, Transmission, and Reflection. Light Can do Three Things: 1) Absorb 2) Transmit or Refract 3) Reflect. Reflection and Refraction of Light. 2. The Interaction of Light and Matter.

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Presentation Transcript
slide1

Reflection and Refraction of Light

11-12

The Interaction of Light and Matter

Absorption, Transmission, and Reflection

  • Light Can do Three Things:
  • 1) Absorb
  • 2) Transmit or Refract
  • 3) Reflect
slide2

Reflection and Refraction of Light

2

The Interaction of Light and Matter

Absorption, Transmission, and Reflection

  • The opaque material in this candleholder only absorbs and reflects light—no light passes through it.
slide3

Reflection and Refraction of Light

  • Materials that allow some light to pass through them,

are described as translucent.

2

Absorption, Transmission, and Reflection

slide4

Reflection and Refraction of Light

  • Transparent materials, such as this candleholder transmit almost all the light

striking them, so you can see objects clearly through them.

2

Absorption, Transmission, and Reflection

slide5

Reflection and Refraction of Light

2

Reflection of Light

Regular and Diffuse Reflection

  • A smooth, even surface such as a pane of glass produces a sharp image by reflecting parallel light waves in only one direction.
  • Reflection of light waves from a smooth surface is regular reflection.
  • To cause a regular reflection, the roughness of a surface must be less than the wavelengths it reflects.
  • Ex: LOOKING IN A MIRROR
slide6

Reflection and Refraction of Light

2

Regular and Diffuse Reflection

  • Reflection of light from a rough surface is diffuse reflection.
  • Diffuse reflection is a type of scattering that occurs when light waves traveling in one direction are made to travel in many different directions.
  • Ex: white cloth
slide7

Reflection and Refraction of Light

2

Refraction of Light

  • Refraction is caused by a change in the speed of a wave when it passes from one material to another.
slide8

Reflection and Refraction of Light

2

Refraction of Light

  • Index of refraction is the ratio of the speed of light in a vacuum to the speed of light in the material.
  • The index of refraction indicates how much the speed of light is reduced in the material compared to its speed in empty space.
  • The larger the index of refraction, the more light is slowed down in the material.
slide9

Reflection and Refraction of Light

2

Refraction of Light

  • White light, such as sunlight, is made up of light waves with range of wavelengths.
  • Prisms refract the light twice—once when it enters the prism and again when it leaves the prism.
slide10

Reflection and Refraction of Light

2

Refraction of Light

  • The longer wavelengths of light are slowed less and are bent the least.
  • As a result, the different colors are separated when they emerge from the prism.
slide11

Reflection and Refraction of Light

2

Diffraction of Light (10-3)

  • Occurs when an object causes a wave to change direction and bend around it.
  • The amount of diffraction that occurs depends on the size of the object
  • If the object is smaller than the wavelength then the wave will bend around it
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