3) What is Ramsden
eyepiece ?
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RAMSDEN EYEPIECE
It consists of two plano-convex lenses of equal focal length separated by the distance equal to two-thirds the focal length of either. The convex faces are towards each other and the eyepiece is placed beyond the image formed by the objective. In this eyepiece cross wires are provided and it is used in optical instruments where accurate quantitative measurements are made.
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