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# OAT Physics

### Chapter 10 - Light and Optics

TermDefinition
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
Created by: JaeBae4444