There is a small ball moving from left to west on the horizontal ground. Now a classmate has taken three pictures of balls A, B and C with his camera.

Physical problems. I feel that the problem is not very good. Lack of conditions.

For example, forget the height of the table.

Didn't say anything about the camera lens of the viewfinder.

Is the lens fixed (or with the movie? This little non-physical problem)

People who don't seem to understand photography are taken for granted.

Personality restriction, can't say more.