When the photographer takes a picture of graduation photo in the class and a bust of Zhang Xiaoming with a fixed focal length camera, the photographer wants to

I answered a similar question two days ago. Is this it?

When someone takes a full-length portrait and then takes a bust with the same camera, then ()

A, people away from the camera, and make the film away from the lens B, people away from the camera, and make the film close to the lens.

C, people close to the camera, let the film away from the lens d, people close to the camera, let the film close to the lens.

My answer: C.

The same camera, that is, the same lens, that is, the focus is fixed.

At this time, if you want to enlarge the imaging, that is, narrow the imaging range, you need to get close to the subject, that is, people are close to the camera.

The distance between the lens and the film of most modern cameras cannot be changed.

But the camera lens is actually a lens group, which can be regarded as a convex lens as a whole, and the film can be regarded as an imaging screen.

In this way, theoretically, if the film moves back (away from the lens), the portrait will be enlarged.

That is, to enlarge the subject, it is necessary to narrow the object distance and increase the image distance.

You can consider using a magnifying glass in your life to help you understand this problem.