Which statement about primary lighting techniques used to reveal security features is correct?

Which statement about primary lighting techniques used to reveal security features is correct?

• A. They are the two primary lighting techniques used to reveal security features
• B. They are the only features used in passports
• C. They are used to print the holder's signature
• D. They are optional features not commonly used

Answer: (A)

Light interacts with a document in specific ways that reveal security features. The two main techniques are incident (reflected) lighting, where light shines on the surface and features reflect it differently, and transmitted lighting, where light is shone through the document from behind so sub-surface elements become visible. These modes uncover most of the common security features used on passports, such as surface printing details and embedded elements like watermarks or fibers that require light from behind to be seen. Because these two approaches capture the primary ways security features are revealed, this statement is correct. The other options don’t fit: passports include many features beyond lighting checks, lighting methods don’t print a holder’s signature, and these techniques are standard practice rather than optional.

Light interacts with a document in specific ways that reveal security features. The two main techniques are incident (reflected) lighting, where light shines on the surface and features reflect it differently, and transmitted lighting, where light is shone through the document from behind so sub-surface elements become visible. These modes uncover most of the common security features used on passports, such as surface printing details and embedded elements like watermarks or fibers that require light from behind to be seen. Because these two approaches capture the primary ways security features are revealed, this statement is correct. The other options don’t fit: passports include many features beyond lighting checks, lighting methods don’t print a holder’s signature, and these techniques are standard practice rather than optional.