Light

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Light

• Illumination

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Illumination

• Ray Model of Light
• Luminous source
• Illuminated source
• Opaque
• Transparent
• Translucent
• Luminous Flux
• Illuminance
• Speed of light, c
• Inverse square law

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Ray Model of Light

• A ray that travels in a straight path
• Does not account for diffraction
• Can only be altered by an object in the path
• Used to model interactions with matter
• Ray optics or geometric optics

Pg 431-438
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Ray Model of Light

• Sources of light
• Luminous source emits light
• Illuminated source reflects light
• Luminous sources
• Examples
• Illuminated sources can be
• Opaque (does not transmit light. May reflect)
• Transparent (transmits light. May reflect)
• Translucent (transmits light, but not clearly.
  May reflect)

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Ray Model of Light

• Luminous flux, P
• Rate at which light energy is emitted from a
  luminous source
• Units lumen (lm)
• All of the light
• Luminous intensity
• Units candela (cd)
• Luminous flux divided by 4p

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Ray Model of Light

• Speed of light
• c 3.0 x108
• Inverse square law
• x1/(y2)
• When y increases, x decreases by a square factor.

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• Reflection
• Ray that returns (bounces) off of a boundary (may
  changes directions).
• Refraction
• Ray that is transmitted through a boundary (may
  changes directions).

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Light

• The Wave Nature of Light

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The Wave Nature of Light

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Polarized Light
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Polarization

• Maluss Law
• Intensity
• Wavelength
• Decrease objects moving toward each other
• Increase objects moving away from each other

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Equation Review
Speed of light as a constant
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Home work

• Describe the similarities and differences between
  the velocity of sound (vf?) and the velocity of
  light (cf?).
• Hint Pg 445
• Describe the similarities and differences between
  the Doppler effect as it applies to sound vs.
  light.
• Hint Pg 407 446

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The Wave Nature of Light

• Diffraction
• Primary Color
• Secondary Color
• Complementary Colors
• Primary Pigment
• Secondary Pigment
• Polarization
• Maluss Law
• Clara!

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The Wave Nature of Light

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Elements