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There are a number of advantages with a reflecting telescope but the most favourable is the fact that it uses a curved mirror which 'reflects' the image as opposed to a refractor which 'refracts' the image. In short, 'white light' is made up from all of the colours of the rainbow. When using a reflecting telescope, the mirror deflects the entire light make-up in one go so that a sharp focal point can be defined. With a refracting telescope, each individual light colour refracts at a different angle meaning that if you place the focusing lens in position for say violet, it will be out of focus for the other six colours.

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