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Pick up the correct statement from the following : | |
A. | the power of a lens is the reciprocal of its focal length [Wrong Answer] |
B. | the power of a lens is the reciprocal of its focal length [Wrong Answer] |
C. | the power of two or more thin lenses in contact is the power of the combination of the lenses [Wrong Answer] |
D. | all the above. [Correct Answer] |