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一、光斑的形成光斑是点光源经透镜折射后成像过程中所有出射线光路的截面图形。因点光源经透镜折射后的出射光线的光路是圆柱形或圆锥形,因此光斑的形状基本为圆形。点光源射到透镜上所有出射线的光路大体分为以下三种:1.点光源在无穷远,成像与焦点时的锥形光斑光路。如图1所示。2.点光源在焦点以外,成实像时的锥形光路。如图2所示。3.点光源在焦点上,不成像时的柱形光路。如图3所示。
First, the formation of spot light spot is the point light source refraction through the lens after the imaging process of all rays cross-sectional image. Since the optical path of the outgoing light after the point light source is refracted by the lens is cylindrical or conical, the shape of the light spot is substantially circular. The light paths of all the outgoing rays emitted by the point light source onto the lens are roughly divided into the following three types: 1. The point light source is at infinity, and the cone-shaped spot light path is formed when imaging and focusing. As shown in Figure 1. 2. The point light source is out of focus and becomes a conical light path when real. as shown in picture 2. 3. The point light source is in focus and the columnar light path is not imaged. As shown in Figure 3.