1. how do you calculate magnification on a microscope? explain how to focus a microscope using the high-power lens. include any safety issues you need to be aware of. why is it important to keep a microscope covered when you’re not using it? sketch what you observe when examining the onion root tip using the low-power lens and the high-power lens. label the sketches or write a brief description of your observations. sketch what you observe when examining the letter ""e"" using the low-power lens and the high-power lens. describe what you saw.