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 $= \frac{f_{o}}{f_{e}} = \frac{200}{2} = 100$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.