Final answer:
Modern image intensifiers often have contrast ratios that exceed 10:1, which allows for better differentiation and clarity of images, especially in low-light conditions.
Step-by-step explanation:
Contrast ratios in modern image intensifiers are a measurement of the ability of the device to distinguish between the lightest and darkest parts of the image. A high contrast ratio is beneficial in these devices, as it allows for better differentiation and clarity of images, especially under low-light conditions. Modern image intensifiers typically achieve high contrast ratios to enhance image quality, often far exceeding a ratio of 10:1. Therefore, the correct answer is that the contrast ratio for modern image intensifiers exceeds 10:1.