Final answer:
Electron microscopes have more resolving power than optical microscopes because electrons have shorter wavelengths. We can control the energy of electrons, which allows us to manipulate their behavior in the microscope.
The correct option is (a).
Step-by-step explanation:
Assertion: Electron microscope has more resolving power than an optical microscope.
Reason: We can control the energy of electrons.
The assertion is true. Electron microscopes do indeed have more resolving power than optical microscopes. This is because electrons have shorter wavelengths than photons, which allows for higher magnification and greater detail. The reason is also true as we can manipulate the energy of electrons to control their behavior in the microscope.
Therefore, the correct answer is option a) Both A and R are true, and R is the correct explanation of A.