How to Correctly Adjust the Focal Length of the Laser .. - MYST LASER
The vertical distance from the focal point of the convex lens to the focal length surface is what we call the focal length.. We usually use F = how much to express its focal length.. Most laser devices are marked with a focus field lens.. For example: F = 163; F = 254, and so on.. The focusing field lens is a very important optical accessory in ..