Which statement best describes how the focal depth behaves in a fixed-focus system?

Which statement best describes how the focal depth behaves in a fixed-focus system?

• A. It Remains Fixed And Does Not Change With Depth
• B. It Changes With Depth
• C. It Automatically Optimizes At Every Depth
• D. Its Depth Is Defined Once And Never Altered By Scanning Mode

Answer: (B)

In a fixed-focus system, you don’t actively adjust the lens to focus at different distances. The focal depth describes where sharpness is achieved for objects at a given distance, and because the scene changes in depth, the plane that looks most in focus shifts as you image closer or farther subjects. The system relies on a wide enough depth of field, but the true best-focus plane isn’t fixed across all depths—so it effectively changes with depth. That’s why the statement that best describes it is that focal depth changes with depth.

In a fixed-focus system, you don’t actively adjust the lens to focus at different distances. The focal depth describes where sharpness is achieved for objects at a given distance, and because the scene changes in depth, the plane that looks most in focus shifts as you image closer or farther subjects. The system relies on a wide enough depth of field, but the true best-focus plane isn’t fixed across all depths—so it effectively changes with depth. That’s why the statement that best describes it is that focal depth changes with depth.