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Investigation of the chromatic aberration of a converging lens.
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Investigation of the chromatic aberration of a converging lens By Wen Yan Gao Aim To find the difference in focal length of a converging lens when used to produce images with red and blue light. Planning Background information Chromatic aberration arises from dispersion- the property that the refractive index of glass differs with wavelength of light. The focal length of a lens is determined by a combination of its geometry and the refractive index of the material from which it is made. The refractive index varies slightly with the wavelength of the light that is being transmitted. This means that the focal length of a lens will vary for different colours of light. For blue light (short wavelengths), the focal length is larger than that of red light (long wavelengths). Prediction It was predicted that the values of the focal length of the lens obtained from red and blue light are different, given that the standard focal...
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