 | Term | Definition |
| |
achromatic lenses |
combination of lenses that correct chromatic abberation |
| |
additive primary color |
red, blue green for light |
| |
additive theory of color |
combining additive primary to make color |
| |
angle of deviation |
angle between the incident ray-emergence ray |
| |
aperature |
opening into camera |
| |
astigmatism |
when the cornea or the lens is shaped wrong, making the eye have different focal points |
| |
chromatic abberation |
defects in lenses that cause white light to disperse into it's components |
| |
critical angle |
when angle of refract is 90, it's angle of incidence that results in angle of reflection |
| |
diopters |
unit used by opticness to describes-prescribe lenses |
| |
dispersion |
separation of a beam of white light into it's component color |
| |
emergent rays |
the ray the leaves the medium |
| |
emission spectrum |
spectrum produced by a substance when heated to incandense |
| |
hypermetropia |
(farsightedness) distance between lens and retina is too small |
| |
index of refraction |
The ratio of the speed of light in vacuum, air, or other medium of reference |
| |
infrared |
radiation beyond the end of spectrum |
| |
lateral displacement |
the difference of path between incident ray and emergence ray |
| |
myopia |
(nearsighted) distance between lens and retina is too great |
| |
Newton's disk |
disk painted with spectrcal colors rotating at high speed |
| |
persistence of vision |
A visual phenomenon where an image is retained in the eye for a short period of time |
| |
presbyopia |
a form of farsightedness in which it is difficult to focus on close objects or to read and occurs as a child ages. |
| |
recomposition |
the recombining of colors of the spectrum for white light |
| |
refraction |
The bending of light as it passes from one medium to another |
| |
shutter |
controls light entering the camera |
| |
snell's law |
is a formula used to describe the relationship between the angles of incidence and refraction |
| |
spectrograph |
device that records spectrum on film |
| |
spectrometer |
device that sends a parallel beam of light through a prism, then through two convergings lenses, then to an eye piece to produce visible spectrum |
| |
subtractive theory of color |
begin with white light and then filters to absorb colors until desired color is left |
| |
total internal reflection |
all light is reflected and none refracted |
| |
ultraviolet |
reigon of the EM spectrum beyond visible violet |
