Cartoon children's photography teaching video

Analysis: The camera works by using the principle that the convex lens reduces the real image. To solve this problem, we must deeply explore the "law of motion between objects, mirrors and images" in convex lens imaging.

First of all, let's discuss the "motion law between objects and images" in convex lens imaging. From the optical path diagram analysis of convex lens imaging, we can know that when the object moves up, the image on the screen moves down; When the object moves down, the image on the screen moves up. This shows that when the object distance is constant, the motion of the image and the motion of the object are "opposite". Therefore, if the image on the screen moves to the right, the object must also move to the left. Next, let's analyze the "mirror motion law" in the convex lens. When the object moves up, the convex lens moves down relative to the object. At this time, the image on the screen also moves down. This experimental phenomenon shows that when the object distance is constant, the real image formed by convex lens and lens (that is, "lens") moves in the same direction. Using this rule, we can help the photographer quickly solve the problem he encountered in the process of taking pictures: if the comic portrait is moved from the position of 1A to the position of 65438+.

Choose B.