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Light

LC Physics. *don't have to learn these but be aware of the meaning of them.

TermDefinition
Laws of Reflection 1. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane. 2. The angle of incidence equals the angle of reflection.
Real Image Image formed by the actual intersection of rays. Can be formed on a screen.
Virtual Image Image formed by the apparent intersection of rays. Cannot be formed on a screen.
Parallax The difference in apparent position of an object when viewed from different positions.
Laws of Refraction 1. The incident ray, the refracted ray and the normal all lie in the same plane. 2. For a given pair of media, the sine of the angle of incidence is proportional to the sine of the angle of refraction (Snell’s law).
Critical Angle The angle of incidence in the denser medium when the angle of refraction in the rarer medium is 90°.
Total Internal Reflection This occurs when the angle of incidence in the denser medium is larger than the critical angle so the light is reflected back into the denser medium.
Optic Fibre Very thin, long and transparent material through which light travels by total internal reflection.
Accommodation The ability of the eye to focus on objects at varying distances by changing the shape of the lens.
Power of a Lens The reciprocal of the lens focal length, i.e. 1/f. The ability to converge or diverge rays
Magnification* The ratio of the image distance/height to the object distance/height.
Incident ray* The light ray coming into the mirror/lens
Reflected/Refracted ray* The light ray leaving the mirror/lens.
Normal* The perpendicular line drawn at the point of incidence of light.
Angles of incidence and reflection* The angles between the rays and the normal.
Focal Point (f)* Halfway between C and the pole.
Centre of Curvature (c)* The theoretical centre of the sphere from which a curved mirror is taken.
Principle Axis* The line joining the optical centre of the mirror to C.
Pole (p)* The point where the principle axis intersects the mirror.
Refraction The bending of light at a boundary as it passes from one medium to another (of a different refractive index).
Reflection The bouncing of a wave/light off a surface.
Created by: dbroomfield
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