Why could you see a virus with your microscope even if you increased the eyepiece lens magnification to 100 X?

You cannot see a virus with a regular light microscope, even at 100X magnification, because viruses are typically much smaller than the resolving power of light microscopes, which is about 200 nanometers. Most viruses range from 20 to 300 nanometers in size, making them invisible at this magnification. To visualize viruses, electron microscopes are required, as they use electron beams instead of light, achieving much higher resolutions.