Many product packages and ID cards use hologram stickers that change colour with viewing angle. Which wave phenomenon makes this possible, and how does it impact society?

Question

BlackTom AI · Accepted Answer

Consider the phenomenon described: hologram stickers that change colour with viewing angle. This effect relies on how light waves interact as they encounter micro- or nano-structured surfaces.
Option a: 'Scattering; enhances indoor lighting' — Scattering involves redirection of light in many directions, but it does not inherently produce angle-dependent colour changes in a controlled, interference-based hologram. So this choice mischaracterizes the mechanism and the practical purpose.
Option b: 'Interference; helps prevent counterfeiting' — This is the correct conceptual link. Holograms rely on interference and diffraction of light from precisely engineered structures to create angle-dependent colours and patterns. Such interference-based features are difficult to reproduce, making holograms effective anti-counterfeiting measures, which impacts society by helping protect brands and consumers from fraud.
Option c: 'Absorption; improves night vision' — Absorption would typically dull or reduce light, not produce the vivid, angle-dependent colour change seen in holograms. It does not align with how holograms are designed to function, and it has no relation to improving night vision.
Option d: 'Refraction; reduces electricity use' — Refraction describes bending of light as it passes between media with different indices, but it does not by itself create the dynamic colour-shifting visuals of holograms. Also, there is no direct link to reducing electricity use in this context.

Many product packages and ID cards use hologram stickers that change colour with viewing angle. Which wave phenomenon makes this possible, and how does it impact society?单项选择题

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