| A | B |
|---|
| Electromagnetic wave | Wave consisting of perpendicular oscillating electric and magentic fields |
| Speed of light | Speed at which an electromagnetic wave propogates (energy) |
| Michelson's method | Method for determining the speed of light using rotating mirrors and split beams |
| Dispersion | Property that materials have that gives different refractive index at different wavelength |
| laser | Light Amplification by Stimulated Emission of Radiation |
| monochromatic | Consisting of just one frequency wave |
| coherent | having a well defined phase relationship |
| diffuse reflection | when light hits a rough surface it is reflected in a range of directions - scattered |
| law of reflection | Angle of incidence = angle of reflection |
| incident | Before thechange |
| ray | Line showing how light travels |
| ray diagram | Simplified diagram using rays to show what optical deviced do |
| real image | Image formed by the meeting of real rays that could be captured on a screen |
| virtual image | Image formed by the meeting of virtual rays that cannot be captured on a screen - V is negative |
| refractive index | Ratio of speed of light in a vacuum to speed of light in a medium |
| Snell's law | ration of refractive index is related to ratio of sin of angles in media |
| medium | Material that wave trvaels in |
| apparent depth | not on current sylabus |
| total internal reflection | not on the current syllabus |
| critical angle | not on the current syllabus |
| periscope | not on the current syllabus |
| converging | Getting closer together |
| diverging | spraeding apart |
| focal point | Point on the principal axis where rays which are incident parallel to the PA meet/cross the axis |
| focal length | Distance from the center of the lens to the focal point |
| principal axis | Line passing perpendicular to the plane of the lens that passes though the optical center |
| linear magnification | Height of image/height of object |
| lens equation | 1/f=1/u+1/v |
| near point | Closest focus for eye - 25 cm |
| far point | furthest comfortable focus -infinity |
| angular magnification | Ratio of angular size of image to object |
| compound microscope | microscope with an eyepiece and objective lens |
| astronomical telescope | uses and eyepiece and objective lens to form an inverted image at infinity |
| spherical aberration | Distortion caused by marginal rays meetin at a different point form axial rays |
| chromatic aberration | dispersion causing colored fringes in images |
| resolution | ability to distinguish to objects - now AHL |
| rayleigh's criteria | can distinguish if central max is further than first min - now AHL |
| Double slit interference | the simple one -where waves from two sources or one source split in two combine to give a pattern |
| single slit interference | Where parts of a wave passing through different parts of a slit give an interference pattern - now AHL |
| diffraction grating | Many lines/cd |
| phase change | some reflections gives a phase inversion |
