![]() ![]() Note that clicking on and activating a radio button other than the one labeled Uncorrected will deactivate the Image Position slider.Ĭhromatic aberration is very common with single thin lenses produced using the classical lens-maker's formula that relates the specimen and image distances for paraxial rays. A set of radio buttons positioned beneath the ray trace pattern allows the visitor to toggle between an uncorrected virtual optical path and one that has been corrected to simulate achromatic, fluorite, or apochromatic optical elements. Moving the slider to the right shifts the focal plane to shorter (blue) wavelengths and produces corresponding changes in the microscope image and point spread functions. When the slider is moved to the left, the focal plane is shifted to longer (red) wavelengths and the microscope image and point spread functions simultaneously change to illustrate the effect of chromatic aberration. The initial position of the slider is the center of the focus range. ![]() The Image Position slider is utilized to control the tutorial by shifting the focal plane along the optical axis of the virtual lens system illustrated as a ray trace pattern on the right-hand side of the applet. Beneath the image window is a pull-down menu labeled Choose A Specimen, which can be used to select a new specimen. The tutorial initializes with an image of the specimen (as seen through the microscope) appearing in a window on the left-hand side of the applet. When the focus is set for the middle of the wavelength band, the image has a green cast with a halo of purple (composed of a mixture of red and blue) surrounding it. This leads to colored fringes surrounding the image. The inability of a lens to bring all of the colors into a common focus results in a slightly different image size and focal point for each predominant wavelength group. In most glasses, the refractive index is greater for shorter (blue) wavelengths and changes at a more rapid rate as the wavelength is decreased.īlue light is refracted to the greatest extent followed by green and red light, a phenomenon commonly referred to as dispersion. When white light passes through a simple or complex lens system, the component wavelengths are refracted according to their frequency. Interactive Tutorials Chromatic AberrationĬhromatic aberrations are wavelength-dependent artifacts that occur because the refractive index of every optical glass formulation varies with wavelength. Molecular Expressions Microscopy Primer: Physics of Light and Color - Chromatic Aberration - Interactive Tutorial ![]()
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