Question

For large magnifying power of a telescope

• A. object must be large
• B. focal length of objective is large
• C. focal length of eyepiece is large
• D. focal length of objective and eyepiece must be large

Hint:

For a telescope $M=\frac{f_o}{f_e}$.

Answer 1

The Correct Option is B

Step 1: Check each option
The object size does not enter $M$. A large $f_e$ would reduce $M$. Making both large leaves the ratio unclear. So (B).

Final Answer:
Option (B). \[ \boxed{\text{(B)}} \]