Holography

noun (uncountable)

/hɒˈlɒɡrəfi/

A photographic technique in which a laser is used to record, and subsequently reconstruct, a three-dimensional image of an object by capturing the full light field — both amplitude and phase information — as an interference pattern on a photosensitive medium; the reconstructed image exhibits genuine three-dimensional parallax. Holography is distinct from stereoscopy or 3D display. In UPSC context, holographic security features are used on Indian currency notes and on Aadhaar PVC cards (UIDAI); holographic electoral rallies (Project Pixel, used by PM Modi in 2014) raised questions on campaign technology regulation; and photonic holography is a research frontier at CSIR-NPC.

✍️ Usage in a UPSC answer

India's Election Commission has yet to frame comprehensive guidelines governing the use of holographic and AI-generated deepfake political messaging, a regulatory lacuna that risks permitting technologically amplified misrepresentation to distort the informed consent that free and fair elections require.

Synonyms

wavefront reconstructionlight-field photographythree-dimensional imaginglaser imaging

Antonyms

two-dimensional photographyflat imagingconventional photography

🌱 Word Family

holography (n), hologram (n), holographic (adj), holographically (adv), holograph (n, also a handwritten document), holographics (n pl, informal)

🔡 Root

Greek holos = whole, complete, entire; Greek graphia = writing, recording (from graphein = to write)

📜 Etymology

The word was coined by Hungarian-British physicist Dennis Gabor in 1947 when he invented holography, for which he received the Nobel Prize in Physics in 1971. Gabor formed the word from Greek holos ('whole') + graphia ('writing/recording'), intending to convey that a hologram records the complete light field — amplitude and phase — unlike a conventional photograph which captures amplitude only.

🧠 Memory Hook

HOLO (whole) + GRAPHY (writing/recording): a hologram records the WHOLE light information — not just brightness (2D photo) but depth and phase too. Nobel 1971 to Gabor is the anchor. Think: a 2D photo is a shadow; a hologram is the real shape recorded whole.

🔬 Science & Technology 📖 Seen in: Emerging Technologies — AI, Quantum Co...

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