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The magnifying power of the astronomical telescope for normal adjustment is 50. The focal length of the eye piece is 2cm. The required length of the telescope for normal adjustment is

$\begin {array} {1 1} (1)\;102\: cm & \quad (2)\;100\: cm \\ (3)\;98\: cm & \quad (4)\;25\: cm \end {array}$

(1) 102 cm