chromatic aberration

Examples of chromatic aberration in the following topics:

• Combinations of Lenses

  • The use of multiple elements allows for the correction of more optical aberrations, such as the chromatic aberration caused by the wavelength-dependent index of refraction in glass, than is possible using a single lens.
  • An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration.
  • The lens elements are mounted next to each other, often cemented together, and shaped so that the chromatic aberration of one is counterbalanced by that of the other.
  • (a) Chromatic aberration is caused by the dependence of a lens's index of refraction on color (wavelength).
  • (b) Multiple-lens systems, such as this achromatic doublet, can partially correct chromatic aberrations, but they may require lenses of different materials and add to the expense of optical systems such as cameras.

• Aberrations

  • A chromatic aberration, also called achromatism or chromatic distortion, is a distortion of colors .
  • Since the index of refraction of lenses depends on color or wavelength, images are produced at different places and with different magnifications for different colors. shows chromatic aberration for a single convex lens.
  • A comatic aberration, or coma, occurs when the object is off-center.
  • These aberrations can cause objects to appear pear-shaped.
  • Spherical aberrations are a form of aberration where rays converging from the outer edges of a lens converge to a focus closer to the lens, and rays closer to the axis focus further.

• The Compound Microscope

  • The advantages of these microscopes, due to the multiple lenses, are the reduced chromatic aberrations and exchangeable objective lenses to adjust magnification.

• The Telescope

  • The potential advantages of using mirrors instead of lenses were a reduction in spherical aberrations and the elimination of chromatic aberrations.
  • With the invention of achromatic lenses in 1733, color aberrations were partially corrected, and shorter, more functional refracting telescopes could be constructed.

• Adding velocities

  • This is the aberration equation.

• Air Wedge

  • To minimize image aberrations of the resulting fringes, the angle plane of the glass wedges has to be placed orthogonal to the angle plane of the air-wedge.

• Thin Lenses and Ray Tracing

  • A thin lens is defined to be one whose thickness allows rays to refract, as illustrated in , but does not allow properties such as dispersion and aberrations.

• The Lensmaker's Equation

  • Lenses have the same focal length when light travels from the back to the front as when light goes from the front to the back, although other properties of the lens, such as the aberrations are not necessarily the same in both directions.