Federal hopefully good luck
Explanation good luck I hope it’s right
The right of equality to all men
Yuri <span>Alekseyevich </span>Gagarin
Two knobs are used to get a clear image on low power. The coarse adjustment knob is used to make drastic changes to the image, and the fine adjustment knob is used to make small adjustments to the image. The reason two knobs are used is because you are supposed to get as clear an image as possible on low power before moving on to the next power, and same with medium power.