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OAT Physics
Chapter 10 - Light and Optics
Term | Definition |
---|---|
1 Angstom | = E-10m |
c (speed of light) | = 3E8 m/s |
A red object means | the object absorbs all colors except red |
reflection | the rebounding of incident light waves at the boundary of the medium |
normal | the line drawn perpendicular to the boundary of a medium |
Law of Reflection | theta 1 = theta 2 |
real image | light actually converges at the position of the image; positive image distance, image in front of mirror |
virtual image | light only appears to be coming from the position of the image but does not converge there; negative image distance, image behind mirror |
Plane mirrors = | virtual image |
concave | looks caved in |
focal length | = r/2; 1/f = 1/i + 1/o |
concave mirrors | converging mirrors; positive focal length |
convex mirrors | diverging mirrors; negative focal length |
magnification | ratio of image's height to the object's height; positive = upright image; = -i/o |
Snell's Law | n = c/v; n1 sin theta 1 = n2 sin theta 2 |
index of refraction | n = c/v |
index of refraction for air | n = 1 |
n for other than air | n > 1 cuz v < c |
when light travels from medium with higher n to medium with lower n | theta 2 > theta 1 |
critical angle | when theta 2 = 90 degrees |
internal reflection | when theta 2 is greater than critical angle and all light is reflected back into original material; can only happen from water to air |
Lens | refract light |
Power to measure lens | = 1/f (diopters) |
Converging lens | convex |
Diverging lens | concave |
Dispersion | when the speed of a wave varies with wavelength; prism |
Diffraction | the spreading out of light as it passes through a narrow opening |
Diffraction Eq | sin theta = tan theta = y/D = (n)wavelength/d |
plane-polarized light | light in which the electric fields of all waves are oriented in same direction; only a certain orientation E is let through; polarizers |
Unpolarized light | a random orientation of the electric field vectors E; sunlight |