Answer:
Step-by-step explanation:
As the electric field oscilates, if you look at a surface parallel to the plates you would see a circulation of the magnetic field. This circulation oscilates in the same frequency. And there would be production of light, dissipating the energy delivered into the capacitor. To make this system stationary you need to provide this energy all the time. Is impossible for this light being a visble light though. The capacitor need to be very thin and oscilating very fast. To produce visible light you always new to oscilate small things, like excitations of electron-hole pair in semiconductors or vibrations of electrons in atoms and molecules.