What principle of magnification does a CCTV use for reading?

• A. Relative distance magnification
• B. Relative size magnification
• C. Equivalent magnification
• D. Rated magnification

Answer: (B)

The principle of magnification utilized by a CCTV system for reading is relative size magnification. This principle operates on the concept that when an object is displayed at a larger size than its actual dimensions, it can be more easily perceived by the viewer. In the case of CCTV, the camera captures an image of the text or object and then enlarges it for display on a screen.

As a result, the text appears larger and more legible compared to how it would look to the naked eye. This effective use of relative size magnification allows individuals with visual impairments to interact with printed materials or objects that might otherwise be difficult to see. Relative size magnification plays a crucial role in making reading accessible by directly increasing the size of the visual information presented to the viewer.