In a transmission electron microscope (TEM), electromagnetic lenses are used to steer and focus the electron beam. Which of the following best describes the primary function of the objective lens?

• A. It accelerates the electrons from the cathode to their high final operating speeds.
• B. It focuses the divergent beam of electrons leaving the electron gun into a parallel beam to illuminate the specimen.
• C. It focuses the electrons that have passed through the specimen to form the first, intermediate magnified image.
• D. It projects the final, highly magnified image onto a fluorescent screen or digital sensor.

In a particular TEM, the electrons are accelerated from rest across a potential difference of 500 V. Relativistic effects are negligible at this accelerating voltage.

Suggest, with a calculation, whether structural details of a specimen with a characteristic size of $0.050nm$ can, in principle, be resolved by this TEM.