A simple microscope has a magnifying power of $3.0$ when the image is formed at the near point $\left(25\text{cm}\right)$ of a normal eye. What is its focal length?

Q. A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. What is its focal length?

Q. A simple microscope has a magnifying power of $3.0$ when the image is formed at the near point of a normal eye. What is its focal length?

Q. A simple microscope has a magnifying power of 3.0 when the image is formed at the near point (25 cm) of a normal eye. (a) What is its focal length? (b) What will be its magnifying power if the image is formed at infinity?

Q. The magnifying power of a simple microscope when the final image is formed at $D=25\text{cm}$ from eye is :
($f$ is the focal length)

Q. Magnifying power of a simple microscope is ( when final image is formed at $D=25cm$ from eye )