1.

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is                   [MP PMT 1991]

A.            200 cm                                    
B.            160 cm  
C.            2.5 cm                                     
D.             0.1 cm  
Answer» D.             0.1 cm  


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