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Pick up the correct statement from the following : | |
A. | spherical aberration may be reduced by diminishing the aperture [Wrong Answer] |
B. | spherical aberration may be minimised by replacing the single lens by a combination of the lenses. [Wrong Answer] |
C. | in telescope objectives, a combination of convex lens and concave lens is used. [Wrong Answer] |
D. | all the above. [Correct Answer] |