Optics: Chromatic Aberrations Flashcards
When a mixture of different wavelengths of light are considered in an aberration it is considered a ___________ aberration
Chromatic aberration
What is dispersion?
The transmission speed of light within a refractive medium that depends upon the wavelength
Is the refractive index the same for each wavelength?
NO
Which wavelengths (shorter or longer) are refracted more?
Shorter wavelengths
What is chromatic dispersion?
The separation of white light into its component elements by an optical element
What happens are the dispersive power increases?
The dispersion of the optical element (prism or lens) increases
What is the Abbe number or constringence?
The reciprocal of the dispersive power
What two factors lead to the selected optical element?
Refractive index and abbe number
What corrects chromatic aberrations?
Achromat doublet
What is Longitudinal chromatic aberration?
When chromatic dispersion occurs and causes the image of the blue rays to form in front of the image of the red rays
*(can be called the distance between image planes)
What is chromatic difference of power?
The variation of power with wavelength
What is transverse (lateral) chromatic aberration?
The variation of the position of the image on the retina with wavelength
Transverse chromatic aberration can also be specified by the ________ between the refracted chief rays for different wavelengths
Angle
What is chromatic difference of position?
The variation of position with wavelength
What is chromatic difference of magnification?
The variation of magnification with wavelength
What happens when the pupil is decentered using an artificial pupil on axis?
Foveal longitudinal chromatic aberration
What is the chromatic aberration along the achromatic axis?
Zero
Which angle is zero is some people?
Angle Psi (angle between visual axis and achromatic axis)
