生活中的透镜,主要包括照相机、投影仪、放大镜等,它们都应用了凸透镜成像的原理.照相机照相机是根据凸透镜成倒立、缩小的实像的原理工作的,如图1,镜头相当于凸透镜,胶片相当于光屏.使用照相机时:(1)景物到照相机的距离总大于像到镜头的距离.(2)景物离照相机越远,所成的像越小.(3)要使照相机成一个清晰的像,需要适当地调节镜头到胶片的距离. Lenses in life, mainly including cameras, projectors, magnifying glass, etc. They are based on the principle of convex lens imaging camera camera is based on the inverted lens into the inverted, reduced real image of the principle of work, as shown in Figure 1, the lens is equivalent to convex lens, film Equivalent to the light screen. When using the camera: (1) The distance between the scene and the camera is always larger than the distance from the camera (2) The farther the scene is from the camera, the smaller the image becomes. (3) Like, you need to properly adjust the distance from the lens to the film.