Q. A Gallilean telescope has objective and eye-piece of focal lengths $200\ cm$ and $2\ cm$ respectively. The magnifying power of the telescope for normal vision is

A) 90
B) 100
C) 108
D) 198
Explanation

(b) For normal vision (relaxed eye), the image is formed at infinity. Hence the magnifying power of Gallilean telescope $= \frac{f_{o}}{f_{e}} = \frac{200}{2} = 100$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.