Which security feature is commonly used to protect photographs on identity documents by appearing and disappearing when tilted?

Which security feature is commonly used to protect photographs on identity documents by appearing and disappearing when tilted?

• A. Hologram
• B. Watermark
• C. Microprint
• D. UV thread

Answer: (A)

Security features that rely on changing appearance with the viewing angle are known as optically variable devices. A hologram fits this idea perfectly because it is a foil image that shifts, colors change, or new imagery can appear as you tilt the ID. This tilt-responsive effect makes the photograph area and surrounding design hard to counterfeit because reproducing the precise diffractive patterns requires specialized equipment. The other features work differently: a watermark shows up when held to light, not when tilted; microprint is tiny text for readability or counterfeit detection; a UV thread glows under ultraviolet light, not due to angle.

Security features that rely on changing appearance with the viewing angle are known as optically variable devices. A hologram fits this idea perfectly because it is a foil image that shifts, colors change, or new imagery can appear as you tilt the ID. This tilt-responsive effect makes the photograph area and surrounding design hard to counterfeit because reproducing the precise diffractive patterns requires specialized equipment. The other features work differently: a watermark shows up when held to light, not when tilted; microprint is tiny text for readability or counterfeit detection; a UV thread glows under ultraviolet light, not due to angle.