Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length

A. i only
B. ii only
C. iii only  
D. i and iii
E. ii and iii

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Correct Answer: C