Chapter 13 Light and Reflection

Light and Reflection Characteristics of light Color and polarization Flat mirrors Curved mirrors

Additive – Mixing Light secondary secondary primary primary primary secondary

Subtractive – Mixing Pigments secondary primary secondary primary primary secondary

Color Color depends on the incident light and the reflected light Explain why an object appears to be black

Practice A 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 𝑐=3.00× 10 8 m/s 𝑐=𝑓𝜆 speed of light=frequency ×wavelength

Illuminance illuminance= perceived power of light area * Illuminance decreases as the square of the distance from the source

Polarization

Light can be polarized by… Reflection Scattering