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Flint glass has a refractive index of 1.645 for blue light and 1.629 for red light. When viewing an image these colors will not focus at the same location due to this effect. This is called chromic abberation. A bi-convex lense made of flint glass in the Edinbouough Telescope has two convex surfaces of radius of curvature of 10 cm. Find the focal length of both the blue and red light.

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