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# Gullett-Phys-Unit3

### Physics-Unit3-Behavior of Light

TermDefinition
reflection the return of light rays from a surface
Fermat's principle of least time light takes the path that requires the least time when it goes from one place to another
Law of reflection the angle of reflection equals the angle of incidence
normal the imaginary line the runs perpendicular to a plane mirror; typically bisects the angle between the incident ray and reflected ray
specular reflection reflection from a smooth surface
plane mirror a flat mirror
convex mirror a mirror that curves outward
concave mirror a mirror that curves inward
diffuse reflection incident light on a rough or granular sufrace, light is reflected in many different directions
polished surface when the surface is so smooth it corresponds to specific wavelength
refraction the bending of a ray of light when passes from one transparent medium to another.
wavefront lines drawn at right angles to a light ray that show the direction and refraction of light as it passes through a transparent medium
critical angle the minimum angle of incidence inside a medium at which a light ray is totally reflected
total internal reflection the total reflection of light traveling within a denser medium when it strikes the boundary with a less dense medium at an angle greater than the critical angle.
converging lens a lens that is thicker in the middle than at the edges and that refracts parallel rays to a focus
diverging lens a lens that is tinner in the middle than at the edges, causing parallel rays to diverge as if from a point.
virtual image an image formed by light rays that do not converge at the location of the image
real image an image formed by light rays that converge at the location of the image. This image can be displayed on a screen
Created by: lpgullett

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