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一.“光斑”与“像”的区别 在光屏上接收的可能是像,也可能不是像而是光斑,像与光斑的意义是不同的,像是物体上每一个发光点成像的集合;光斑是锥形光束被光屏所截得的圆形,像的大小、形状与发光物体有关,而与透镜的孔径无关,而光斑的形状、大小则与透镜的孔径有关,所以我们应注意以下两点: 1.不能认为凡是光屏上接收到的都是实像; 2.光屏到透镜的距离不一定是像距。
1. The difference between “light spot” and “image” may be like or not like light spot on the light screen. The meaning of the light spot is different from that of the light spot, such as the collection of each light spot on the object; The spot is the circle of the cone beam intercepted by the screen. The size and shape of the image are related to the light-emitting object, but not the aperture of the lens. The shape and size of the spot are related to the aperture of the lens. Therefore, we should pay attention to the following: Two points: 1. Can not think that all received on the screen are real images; 2. The distance from the screen to the lens is not necessarily the image distance.