As white light passes through a lens, a separate image is obtained for each wavelength or color of the spectrum due to the dispersion behavior of glasses, i. e. refraction of the glass is different for different wavelengths. These images overlay each other resulting in an erroneous and blurred image with colored edges. This effect can be corrected by placing a convergent lens and a divergent lens of different composition one after the other.
KeywordsCrystallization Zirconium Silicate Fluoride Fluor
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