Light and the Electromagnetic Spectrum

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Light and the Electromagnetic Spectrum
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Light as a Wave

• light is a visible form of energy
• most of the energy that surrounds us is invisible
• this energy travels in waves made of electric and
  magnetic fields
• called Electromagnetic Radiation

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Light as a Wave

• Electromagnetic Spectrum the entire range of
  visible and invisible energy waves

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Properties of Waves
wavelength
amplitude
amplitude
wavelength
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Wavelengths of the Electro-Magnetic Spectrum
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Wavelength and Colour
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Seeing Colour
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Pinhole Camera
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How Light is Transmitted
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Transparent allows light to pass through
Translucent allows some light to pass through
Opaque allows no light to pass through
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Light Reflection

• The reason we see objects is because they reflect
  light

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Smooth Surface
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Rough Surface
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Reflection in a Plane Mirror
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Activity 4.11

• How Light Reflects

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A
B
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Law of Reflection

• When light reflects off a surface, the angle of
  incidence is always equal to the angle of
  reflection

?i ?r
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Looking in a mirror
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Looking in a mirror
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Looking in a mirror
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Object distance vs. Image Distance