Question

A 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

Answer 1

The correct option is B 100

For normal vision (relaxed eye), the image is formed at infinity. Hence the magnifying power of
telescope $=\frac{f_0}{f_e}=\frac{200}{2}=100.$