An astronomical telescope is set for normal adjustment

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

An astronomical telescope is set for normal adjustment. The focal length of its objective lens is

100\,\text{cm}

and that of the eyepiece is

5\,\text{cm}

. Calculate (i) the magnifying power of the telescope, and (ii) the length of its tube.