1.

Four lenses of focal length + 15 cm, + 20cm,    + 150cm and + 250 cm are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eye-piece should be  [CPMT 2001; AIIMS 2001]

A.            + 15 cm                                   
B.            + 20 cm
C.            +150 cm                                 
D.            + 250 cm
Answer» B.            + 20 cm


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