Q. The focal lengths of the objective and the eye piece of telescope are 100 cm and 10 cm respectively. The magnification of the telescope when final image is formed at infinity is
A) 0.1
B) 10
C) 100
D) $\infty$
Explanation
(b) For a telescope, magnification when final image is formed at infinity
$m_{\infty} = \frac{f_{0}}{f_{e}} = \frac{100}{10} = 10$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.