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Pick up the correct specification of Ramsden eyepiece from the following : | |
A. | it consists of two equal piano convex lenses [Wrong Answer] |
B. | the curved surfaces of plano-convex lenses face each other [Wrong Answer] |
C. | the two lenses are separated by a distance equal to 2/3 of the focal length of either lens. [Wrong Answer] |
D. | all the above. [Correct Answer] |