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Chapter 13
Light and Reflection
Light and Reflection
• Characteristics of light• Color and polarization• Flat mirrors• Curved mirrors
secondary
secondarysecondary
primary primary
primary
Additive – Mixing Light
secondary
secondary
secondary
primaryprimary
primary
Subtractive – Mixing Pigments
ColorColor depends on the incident light and the reflected light
Explain why an object appears to be black
PracticeA lens for a spotlight is coated so that it does not transmit yellow light. If the light source is white, what color is the spotlight?
A house is painted with pigments that reflect red and blue light but absorb all other colors. What color does the house appear to be when it is illuminated by white light? What color does it appear to be under red light?
Electromagnetic Spectrum
electromagnetic wave = a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light
Speed of EM Waves / Speed of Light
Illuminance
* Illuminance decreases as the square of the distance from the source
Polarization
Light can be polarized by…
1) Reflection
2) Scattering