What occurs when changing from a 9" mode to a 6" mode in a multifield image intensifier?

What occurs when changing from a 9" mode to a 6" mode in a multifield image intensifier?

• A. Resolution increases
• B. Resolution decreases
• C. Brightness increases
• D. Field of view increases

Answer: (A)

Moving from a 9" to a 6" input field increases geometric magnification, so the image on the output screen is enlarged more. This larger projection makes fine details appear sharper, improving spatial resolution. The tradeoffs are that brightness falls because fewer photons reach the output per unit area, and the field of view shrinks, not expands. So the best outcome of using the smaller field size is an increase in resolution. The other effects listed (brightness increasing or field of view increasing) don’t occur with this change, and resolution would not decrease in this magnification mode.

Moving from a 9" to a 6" input field increases geometric magnification, so the image on the output screen is enlarged more. This larger projection makes fine details appear sharper, improving spatial resolution. The tradeoffs are that brightness falls because fewer photons reach the output per unit area, and the field of view shrinks, not expands. So the best outcome of using the smaller field size is an increase in resolution. The other effects listed (brightness increasing or field of view increasing) don’t occur with this change, and resolution would not decrease in this magnification mode.