Physics

Problem

For a certain compound microscope

L=18\,\text{cm}

f_o=0.4\,\text{cm}

and

f_e=3.0\,\text{cm}

. If the final image is first adjusted at infinity and then shifted to the near point of the eye (

D=25\,\text{cm}

) without altering any lens, what is the ratio of its magnifying power at the near point to that at infinity? a)

1.15

1.40

1.12

1.00