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# Light

### Light, Reflection and Refraction

electromagnetic wave a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light
reflection the change in direction of an electromagnetic wave at a surface that causes it to move away from the surface
angle of incidence the angle between a ray that strikes a surface and the line perpendicular to that surface at the point of contact
angle of reflection the angle formed by the line perpendicular to a surface and the direction in which a reflected ray moves
virtual images an image from which light rays appear to diverge, even though they are not actually focused there; a virtual image cannot be projected on a screen
refraction the bending of a wave front as the wave front passes between two substances in which the speed of wave differs
lens a transparent object that refracts light rays such that they converge or diverge to create an image
total internal reflection the complete reflection that takes place within a substance when the angle of incidence of light striking the surface boundary is greater than the critical angle
critical angle the angle of incidence at which the refracted light makes an angle of 90 degrees with the normal
Law of reflection Angle of Incidence = Angle of Reflection
optical fibres They are commonly used in telecommunication and medicine for transmitting signals and light
Ray Digrams diagram that traces the path that light takes in order for a person to view a point on the image of an object
incidence ray line representing the light travelling into the mirror or glass is called...
reflected ray The ray that reflects off of the mirror and equals the incident ray.
Normal line An imaginary line drawn perpendicular (90 degrees) to a surface.
plane mirror a mirror with a flat surface
Law of refraction when light enters a new medium at an angle, the change in speed cause the light to bend, or refract
index of refraction a measure of the amount a ray of light bends when it passes from one medium to another
angle of refraction The angle between the refracted ray and the normal
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