Chromatic Aberrations Flashcards
chromatic aberration is a ____ order imaging error (like blur or defocus)
first order
chromatic aberration is resulting from:
the dependence of refractive index on wavelength
in chromatic aberration example of spreading white light into a rainbow like spectrum following refraction by a prism, notice _____ light is deviated more than ____ light
blue light always will be deviated more than red light
known as chromatic dispersion
what are colored fringes?
colored bringes are the chromatic aberration of the prism due to dispersion
the chromatic properties of optical materials can be summarized in a single parameter called the:
Abbe number
the chromatic properties of a material normally are based on what?
they are normally based on the refractive indices at specific emission wavelengths in the visible spectrum
longitudinal chromatic aberration (LCA) =
Df - Dc
the dispersive power (ω) of an optical material is =
(nf - nc) / (nd - 1)
relationship of Abbe number (v) and dispersive power (ω)
v = 1/ω
abbe number (v) can be found using =
(nd - 1) / (nf - nc)
LCA in terms of marked power =
Dd / v
the CA value (chromatic aberration of a prism, or angular dispersion) =
Δd / v
Δd= deviation of a prism
the greater the abbe number the ____ the chromatic aberration
greater Abbe number = less chromatic aberration
d= deviation in prism diopters =
100 (ρ / f’) = ρ (cm) D
looking through a spectacle lens at positions away from the optical center leads to
transverse CA and possibly colored fringes
