Photographic Problems Involved in Physics of Grade Two in Junior High School

Our teacher said that the object distance increases, the image distance decreases and the image becomes smaller.

The object distance decreases, the image distance increases and the image becomes larger.

So if you want to take a bust, the image will get bigger. Therefore, according to the theory of "the object distance becomes smaller, the image distance becomes larger, and the image becomes larger", the object distance will become smaller and the image distance will become larger. Therefore, shortening the distance between the camera and the students means reducing the object distance, while extrapolating the lens means increasing the image distance.