Physics

Problem

Microscope A uses an objective of focal length

0.25\,\text{cm}

, an eyepiece of focal length

2.5\,\text{cm}

and has a tube length

16\,\text{cm}

. Microscope B employs the same eyepiece but its tube length is only

12\,\text{cm}

. If Microscope B is to provide the same magnifying power as Microscope A, what focal length should its objective have? a)

0.32\,\text{cm}

0.15\,\text{cm}

0.19\,\text{cm}

0.25\,\text{cm}