1. Light Illumination

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

3. 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

4. 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)

5. 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 4π

6. Ray Model of Light Speed of light –c = 3.0 x10^8 Inverse square law –x=1/(y^2) –When y increases, x decreases by a square factor.

7. 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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9. Light The Wave Nature of Light

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15. Polarized Light

16. Polarization Malus’s Law Intensity Wavelength –Decrease – objects moving toward each other –Increase – objects moving away from each other

17. Equation Review Speed of light as a constant

18. Home work Describe the similarities and differences between the velocity of sound (v=fλ) and the velocity of light (c=fλ). –Hint: Pg 445 Describe the similarities and differences between the Doppler effect as it applies to sound vs. light. –Hint: Pg 407 & 446

19. The Wave Nature of Light Diffraction Primary Color Secondary Color Complementary Colors Primary Pigment Secondary Pigment Polarization Malus’s Law Clara!

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21. Elements