Chromatic and spherical aberration (AQA A-Level Physics): Flashcards
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Practise the cards
10 cards from this deck
Aberrations in refracting telescopes
Aberrations in refracting telescopes
Optical defects that degrade image quality
Cause of chromatic aberration
Cause of chromatic aberration
Dispersion - refractive index varies with wavelength
Which light is refracted more: blue or red?
Which light is refracted more: blue or red?
Blue/violet light (shorter wavelength) refracted more strongly
Visual effect of chromatic aberration
Visual effect of chromatic aberration
Coloured fringes around objects in the image
Achromatic doublet
Achromatic doublet
Two lenses that bring two wavelengths to same focus
Glass types in achromatic doublet
Glass types in achromatic doublet
Crown glass (low dispersion) and flint glass (high dispersion)
Cause of spherical aberration
Cause of spherical aberration
Curved lens shape causes rays to focus at different positions
Which rays deviate most in spherical aberration?
Which rays deviate most in spherical aberration?
Edge rays deviate more than rays near optical axis
Visual effect of spherical aberration
Visual effect of spherical aberration
Image blurring (not coloured fringes)
Which aberration affects all wavelengths equally?
Which aberration affects all wavelengths equally?
Spherical aberration