Why the magnification increases the depth of field decreases?

As magnification increases, the depth of field decreases due to the way light and optics interact. Higher magnification focuses on a smaller area, which means that only a thin slice of the subject is in sharp focus at any given time. This narrow focus results in less depth of field, making it more challenging to keep both foreground and background elements in focus. Consequently, as you zoom in on a subject, the range of acceptable focus becomes limited.