Do you understand the principle of the lens? Today, let’s follow the editor of china Sphero cylindrical lens for a simple understanding!
A glass or plastic component used in lamps can change the direction of light or control the distribution of light.
Lens is the basic optical element that composes the microscope optical system. The objective lens, eyepiece and condenser are all composed of single and multiple lenses. According to their different shapes, they can be divided into two categories: convex lens (positive lens) and concave lens (negative lens).

When a beam of light parallel to the main optical axis passes through the convex lens and intersects at a point, this point is called the "focus", and the plane passing through the focal point and perpendicular to the optical axis is called the "focal plane". There are two focal points. The focal point in the object space is called the "object focal point", and the focal plane there is called the "object focal plane"; conversely, the focal point in the image space is called the "image focal point". The focal plane at the position is called the "image square focal plane".
After the light passes through the concave lens, it becomes an erect virtual image, and the convex lens becomes an inverted real image. The real image can be displayed on the screen, but the virtual image cannot.
In summary, the editor of china Sphero cylindrical lens tells: a brief introduction to the principle and related knowledge of the lens.