If the focal length of objective lens is increased, the magnifying power of
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Microscope will decrease & telescope will increase
For microscope,
Magnifying power = $\frac{L D}{f_0 f_e}$
Hence, $M P \propto \frac{1}{f_0}$
For telescope
Magnifying power $=\frac{f_{\circ}}{f_e}$
Hence, $M P \propto f_0$