question_answer 32)

A small telescope has an objective lens of focallength 140 cm and an eye piece of focal length5'0 cm. What is the magnifying power of thetelescope for viewing distant objects when (a) the telescope is in normal adjustment (i.e.,when the final image is formed at infinity) ? (b)the final image is formed at the leastdistance of distinct vision (25 cm) ?  

Answer:

(a) In normal adjustment, (b) When the image is formed at the leastdistance of distinct vision,