PES 100 –Physics in Everyday Life – Evaluation Overview
UNIT 4: (Chapters 16 – 18) Light, Color, & Image Formation; Atoms
Griffith ‘The Physics of Everyday Life’ 7th.ed.
Definitions
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Electro-magnetic waves & their sources, E-M spectrum order, visible light color order, AM & FM, color (additive & subtractive), specular & diffuse reflection,
wave/particle duality
Transparent vs. translucent, light rays, angle of incidence, “normal to the surface”, reflection, refraction, index of refraction, total internal reflection, focal point and focal
length, object/image distance, concave & convex, diverging & converging rays, real & virtual images, upright & inverted, magnification, dispersion of color (prisms),
diffraction of light (bending around edges), converging (concave) and diverging (convex) mirrors, converging and diverging lenses, LASER acronym, constructive &
destructive interference
Electron shells (or energy levels), photon emission & absorption
Units
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Index of refraction (unitless), magnification (unitless, positive=upright, negative=inverted, greater than 1=image is bigger, less than 1=image is smaller), speed of light in
a vacuum or through a medium (m/s)
Relationships
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Path length difference, wavelength & interference patterns;
Incidence angle & reflection angle; Index of refraction & speed of light in a medium; Magnification, image height & object height, upright/inverted; Image distance,
object distance & focal length; Focal length and radius of curvature;
Applications
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Microwave ovens, prisms, radio communication (AM & FM), soap bubbles & oil on water, rainbows, blue skies, red sunsets; measuring light’s wavelength
Flat, convex & concave mirrors; flat, convex & concave lenses; fiber optics, reflections on a lake; eye shape and vision correction
The following list of equations will be provided on the last page of the traditional multiple-choice exam.
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c=f* (light waves)
cn=c/n,
i=refl [reflection],
n1*sin(1)=n2*sin() [refraction]
F=1/2 C,
M=-hi/ho
1/do + 1/di = 1/F, [Mirrors and thin lenses]
f=frequency, =wavelength, T=period, F=focal length, C=radius of curvature, n=index of refraction, v=speed of a wave, c=speed of light, c n=speed of light in a material,
n=index of refraction, M=magnification, h=object or image height
R. Gist
Version 4